6. Of the following pairs write which ones could be used as buffers and why: (a) 0.1 M NaOH and 0.1 M NaCH3COO, (b) 0.01 M H2SO4 and 0.01 M K2S04, (c) 0.01 M NH3 and 0.02 M NH4CI, (d) 0.2 M HNO2 and 0.2 M NaNO2.
Q: What is the pH of a solution made by mixing 25.00mL of .1500M NaOH with 25.00mL of .2500M HClO2?
A: HClO2 is Chlorous acid which is a weak acid. Weak acid dissociate weakly in aqueous solutions.…
Q: 1. Prepare 30 mL of a 5 mg/mL oral phenobarbital solution using phenobarbital available from the…
A: Given values: Concentration of phenobarbital stock solution = 65 mg/ml Concentration of the…
Q: 1. What concentrations should be used to prepare an ammonia-ammonium ion buffer with a pH of 9.50?…
A: pka defines the biological and chemical behavior of an electrolyte. it also gives an…
Q: 2. What concentration of H (aq) corresponds to each of the following? pH = 10.92 РОН %3D4.32 РОН %3D…
A: pH is the measure of the strength of H+ ion or Hydronium ions in solution. pH at which 50%…
Q: How would you dilute 0.1 M boric acid in 1:10 ratio to 0.01M?
A: Given Values: Initial Conc. of boric acid = 0.1 M Final Conc. of boric acid = 0.01 M Dilution = 110…
Q: 9. Compare the pH of milk and vinegar, which one is more acidic? How much is the difference between…
A: Since you have asked multiple questions, we will solve the first question for you. If you want any…
Q: 2. Four unidentified solutions of equal concentration (0.1 mol/L) were prepared by chemistry…
A: The acidity of a solution is dependant on the concentration of protons or hydronium ions in the…
Q: 1. If I make a solution by adding 83 grams of sodium hydroxide (NaOH) to water to give 750 mL of…
A: Number of moles (mol) = Mass (g) / Molar Mass (g/mol)Concentration (g/L) = Mass (g) / Volume…
Q: 2. Describe how you would prepare the following solutions: d) 250 mL of 0.10 M NH3 from a 14.8 M…
A: To prepare 250ml of 0.10M solution we need to dilute the 14.8M stock solution. The dilution is…
Q: 1) A solution is made by combining 128 mL of ethanol and 0.452 L of water. In this solution, what is…
A: Hi! Thanks for your question. But as you have posted multiple questions, I am answering only the…
Q: +2, and 4.03. the following 0.10 M solutions available: CH3COOH, NACH:C00, NHẠCI, NH3, NAHCO:, and…
A: A buffer is a solution that resists the change in the pH. The pH value of the buffer solution can be…
Q: 1. How many molecules of NaCl are there in a 50.0 g sample of NaCl? The molecular weight of NaCI is…
A: Note: We are authorized to answer one question at a time since you have not mentioned which question…
Q: 1. Calculate the pH of a buffer solution made from 0.20 M CH3COOH and 0.50 M CH3COO- that has an…
A:
Q: 5. What is the reaction of phenolphthalein and methyl orange in acid-base solution? Acid Base…
A: “Since you have asked multiple questions, we will solve the first question for you. If you want any…
Q: 1.What is the molar concentration of a 15% glycerol solution?…
A: For the first question, 15% glycerol solution represents that 15g of glycerol is dissolved in 100mL…
Q: 4. Would you expect the salt solution of CH,NH,Br to have a pH equal to, greater than, or less than…
A: CH3NH3Br: Methylammonium bromide. In an aqueous solution, it will dissociate as CH3NH3+ and Br- From…
Q: 1) If you have 2.5g of hydrocortisone POWDER, how many grams of a 0.05% ointment can be compounded?
A: Hydrocortisone is the name for hormone cortisol when supplied as a medication. It can be used as…
Q: 8. In an experiment, the concentration of the pesticide Lindane (L) was determined by GC analysis by…
A: Given in the question : The peak area of lindane standard solution = 44000 (0.01 M) So, 44000 gives…
Q: 15. Calculate and explain how to make 800 mL of a 5% solution from a 20% solution.
A: A solution is a homogeneous mixture of two or more substances in relative proportions that can be…
Q: 4. Calculate the pH of a 0.10 M HF solution, given that the KA = 6.8 x 10+ at 25 C. HF(aq) + H2O(1)…
A: The acid dissociation leads to an increase in the hydrogen ion concentration in the solution. The…
Q: 28. Locke-Ringer's solution contains 9 g of sodium chloride, 0.24 g of calcium chloride, 0.42 g of…
A: Locke- Ringer's Solution: Ringer's solution is a mixture of salts mixed in water that is used to…
Q: 8. What is the molarity of the solution prepared by diluting 75 mL of 1.50 M silver nitrate (AgNO3)…
A: Molarity of a solute is the number of moles of solute per liter of solution. The concentration or…
Q: 1. One liter of an aqueous solution contains 0.10 M Lys at pH=10.8, and 0.1 M HCl is subsequently…
A:
Q: 1. How many mL of a ½ strength magnesium sulfate solution will contain 10 grams of magnesium…
A: As per question, 1ml MgSO4 contain 1/2gm MgSO4 (concentration is 50%) So 10gm MgSO4 will contain ,…
Q: 1. What caused the color changes in containers A, B, C, and D? 2. What is the effect of the sprite/…
A: Buffers are solutions that can maintain a steady pH despite the addition of modest amounts of acids…
Q: 1. A small volume of water containing a high concentration of particle C is added to a container of…
A: Answer :- Option (B) is correct. - Competition by particles A and B together to occupy less space…
Q: 3. Why are we able to look at the melting temperature of a solution and use Kr values in our…
A: The atomic bonding strength of any substance is indicated by its melting point. on applying…
Q: 7. The chemical you are testing has a concentration of H* as 10³ M (must watch the video). A) What…
A: pH is a measure of the concentration of hydrogen ions in a given solution. Higher the concentration…
Q: What is the primary standard for iodine solutions?
A: INTRODUCTION Iodine solution It is a disinfectant and antiseptic agent, used to prevent infection in…
Q: 4. Which of the following would be considered a basic solution? A. Solution with [OH-] = 3.8 x 10 M…
A: We can find out this using formula pH + pOH = 14 pOH = -log[OH-] and pH = -log [H+]
Q: If you need to set an experiment at 0 degree C, what will be the physical state of the water in the…
A: Water is present in three forms: solid, liquid, and gas. Conversion from one form to another depends…
Q: 12 If strong-base anion exchange resin is applied to treat raw water with silicate, the pH of raw…
A: Note : Hi ! Thank you for the question. We are authorized to answer one question at a time. Since…
Q: How many mL of distilled water must be added to make the Benzalkonium chloride preparation isotonic
A: Calculate in next step
Q: 7. Describe the preparation of 500 ml final volume of a 100 mM NaCl solution from a 0.25M NaCl stock…
A: We are authorized to answer one question at a time since you have not mentioned which question you…
Q: 05:Calculate the grams of each substance requied to prepare the following solutions:(a)250 ml of 0.1…
A: Multiple questions asked. 1st question will be answered, as permissible by guidelines. Asked :…
Q: 1. A solution containing polymer of an unknown structure, and with an approximate molar mass of 1.75…
A: Osmotic pressure can be defined as the minimum pressure that must be applied to halt the flow of…
Q: 4.1 11 (a) Define a buffer solution (b) What are the components of (i) an acidic buffer ?
A: Acids are those compounds that are able to donate the Hydrogen ion(proton) to the other substance…
Q: 7. Which of the following is a valid buffer? A. 0.30 M HNO, and 0.30M NANO, B. 0.20 M HF and 0.10 M…
A: Buffers are solutions that do not alter pH when diluted or when tiny volumes of acids or alkalis are…
Q: 1. The K, of acid HX is 2.0 x 10 NaX is a salt that produces its conjugate base X What is the pH of…
A: Given Values: Ka value of [HA] = 2.0 × 10-6 pKa = - log Ka = - log 2 × 10-6 = 6 - log 2 = 6 -0.30 =…
Q: Find the final concentration as a percent (w/v) of dextrose when 75 mL dextrose 50 % (w/v), 50 mL of…
A: There are different ways to denote the concentration of a solution. Per cent (w/v) means there is 1…
Q: 2. If it is assumed that a sample of Sodium Carbonate weighing pure 2.6250g required 60.20mL of the…
A: Normality (N)can be defined as the number of gram equivalent of solute that is present in a…
Q: 3. How will you prepare 500 ml of 0.750 M citrate buffer with pH of 4.25 from solid citric acid…
A: Given Values: The volume of the buffer = 0.5 L or 500 ml The concentration of citrate buffer = 0.75…
Q: 2. You are given 575mL of a .200M solution of NaOH and are adding 600mL of wate What is the new…
A: Given that the initial concentration is .2 M and volume is 575 ml . We have to find concentration…
Q: 6. Your pharmacy has on hand Robitussin CF Syrup (guaifenesin 100 mg/1 tsp). You receive a…
A: Guaifenesin is a cough syrup used to treat dry cough. It is an expectorant that loosens up the…
Q: 1. What is the advantage of using an iodophor (betadine) rather than iodine or an iodine tincture?
A: As per the guidelines, first is answered. Disinfectants are chemical agents that are built on inert…
Q: How would you dilute 0.1 M boric acid in 1:10 ratioto 0.01M?
A: The concentration of a substance in solution is the abundance of a constituent divided by the total…
Q: 1. What is the chemical formula for palmitic acid and oleic acid? Which one is a saturated fat and…
A: # According to our guidelines we can answer only the 1st question. So, please upload the questions…
Q: 25. What would be the new pH of a 1L buffer solution (pH=7.8) upon the addition of 3mL O.0001 M HCI.…
A: A buffer solution is an aqueous mixture of a weak acid and its conjugate base, or vice versa, known…
Q: 1. Calculate the pH of the solution with hydrogen concentration provided below: a. [H*] = 1.0x 10²…
A: pH is an important chemical parameter in water analysis. Different solutions will have different pH…
Step by step
Solved in 2 steps
- 25. What would be the new pH of a 1L buffer solution (pH=7.8) upon the addition of 3mL 0.0001 M HCI. (Buffer, pka=7.2) * A.) 4.9 O B.) 10.0 O C.) 3.0 O D.) 0.0001 O E.) No detectable effect1. Shown below is the chromatogram for some amino acid standards and two unknowns. Each unknown consists of just a single amino acid. Answer the following questions based on this chromatogram. Solvent Frort Ala Ser Asp Are UrkX Unk Y a) Explain the trend in the distances travelled by the standard amino acids. b) Calculate the R¢values of the standard amino acids and the two unknowns. Show your computations. c) Based on your calculations, what are X and Y? d) Are you able to identify X unambiguously? How about Y? e) If you are unable to identify either one of the unknown amino acids, think of a method by which you can separate them from each other. Explain your answer.3.) A mixture of amino acids was subjected to paper chromatography with six amino acid standards in order to determine its composition. After visualization using ninhydrin, the measured distances were as follows: A B с D E F G a.) What is the Rf value of each amino acid observed? X Distances: Solvent 10.3cm A 4.50cm B - 1.32cm C - 6.60cm D - 5.20cm E - 3.52cm F 8.70cm G - 10.26cm X1 - 9.72cm X2 - 4.3cm X3 7.1cm - b.) What are the possible components of the amino acid mixture? Answer can be up to two amino acids per component.
- At what pH does a lysine solution exhibit the highest buffering capacity? (Lysine pKas: pk1 = 2.2, pK2 = 8.95, pK3 = 10.5) %3D O рH 12.1 О рH 9.72 O pH 5.67 pH 8.95I want to make a buffer solution containing 1 M glycene pH = 10 (Na+), 1 mM ZnCl2 , 1 mM MgCl2. I have the stock solutions 1 M glycene, 1 M MgCl2, 1 M ZnCl2, and 10 M NaOH. My final volume of buffer solution needs to be 250ml. how much (in ml) of each solution should i put into my buffer?3. A buffer was prepared by dissolving 15 grams if ammonium chloride in 100mL solution prepared by diluting 15mL of concentrated ammonia [28% by mass with a density of 1.00 g/mL] to make 100mL solution of dilute ammonia. a. What is the pH of the buffer solution? b. What will be the change in pH if 10mL of 0.005M HCl is added to 25mL of this buffer solution? c. What will be the change in pH if 10mL of 0.005M NaOH is added to 25mL of this buffer?
- 5. We have 100 mL of 5X TBE (Tris/Borate/EDTA) solution and need to make 1 L of 2X solution. Solid compounds also exist for each of these materials. The molecular weight of Tris is 157.60; Borate has molecular weight of 58.80 and EDTA has a molecular weight of 292.44. a) What is the stock concentration? b) What is the final concentration? c) What is the starting volume? d) What is the final volume? e) Write out the equation used to solve this. Show all your work. Are we able to make a solution using this dilution method using are starting materials? If not, propose another way to make the desired concentration and volume of the solution. Show your work.8. What mass of solute is needed to prepare each of 1.00 L of 0.125 M K2SO4 solutions? (2 Points) 21.8 g K2SO4 218.0 g K2SO4 2.816 g K2SO4 28.16 g K2SO41. Calculate the pH of a buffer solution made from 0.20 M CH3COOH and 0.50 M CH3COO- that has an acid dissociation constant for CH3COOH of 1.8 x 10-5.
- 3. Consider the following acids and their dissociation constants: H:SO:(aq) + H20(1) = H:O-(aq) + HSOr(aq) Ka = 1.2 x 10-2 HS-(aq) + H2O(1) = H3O-(aq) + S(aq) Ka = 1.3 x 10-19 a) Which is the stronger acid, H:SOs or HS? b) What is the conjugate base of H2SO?? c) Which acid has the weaker conjugate base? d) Which acid has the stronger conjugate base? e) Which acid produces more ions?4. Would you expect the salt solution of CH,NH,Br to have a pH equal to, greater than, or less than 7 when dissolved in water? Explain. 5. At a certain temperature, the solubility of BaF, is 7.4 x 103 moles per litre. Calculate the Ksp of BaF,. 6. In an experiment, 20.0 ml of 0.0060 M Cacl, and 20.0 mL of 0.0050 M Na,so, are mixed together. Will a precipitate form? The Ksp of Caso, is 2.4 x 105.2.) An unknown amino acid was subjected to paper chromatography with five amino acid standards in order to identify it. After visualization using ninhydrin, the distances travelled were measured as follows: A B с D E X Distances: Solvent - 9.3cm A - 1.33cm B - 4.75cm C - 2.44cm D - 7.62cm E - 8.75cm X - 1.45cm a.) What is the Rf value of each amino acid sample? b.) Arrange the amino acids from most non-polar to least non-polar (include sample X). c.) What is the possible identity of the unknown amino acid? Answer can be up to two amino acids.