The percentage or ratio strength (concentration) of a component in a pharmaceutical preparation is based on its quantity relative to the total quantity of the preparation. If the quantity of the component remains constant, any change in the total quantity of the preparation, through dilution or concentration, changes the concentration of the component in the preparation inversely. An equation useful in these calculations is: (1st quantity) ?x (1st concentration) ?= (2nd quantity) x? (2nd concentration) Show your complete solution. 1. A pharmacist needs 100 mL of 60% ethyl alcohol. If the available concentration of alcohol is 70%, compute for the volume of water and volume of 70% ethyl alcohol needed to prepare the desired concentration. Volume of 70% ethyl alcohol needed =  Volume of water needed =

Q: Complete the table below by deciding whether a precipitate forms when aqueous solutions A and B are…

A: For each solution A and B it is check whether precipitate forms or not and so if it forms emprical…

Q: 14.1 mL of 0.134 M Pb(NO3)2 is mixed with 12.9 mL of 0.324 M KI. Calculate the final concentration…

A: Answer:When solutions of two different substance are mixed and formation of precipitate takes place…

Q: Is a diagram representing a solvent A() in a 1-L beaker, and a solute X dissolved in the solvent.…

A: Given that the solute addition does not change the volume of the liquid significantly. So, volume of…

Q: S Part 2 • Calculations and Results. Show all your step-by-step calculations and write your results…

A: Molarity of titrant, NaOH used = 0.350 M  The balanced equation for the reaction is: NaOH(aq) +…

Q: 100.0 mL of an aqueous solution containing 0.250 M KOH(aq) is mixed with 100.0 mL of an aqueous…

A: First of all, we need to write down the balanced chemical.  The molar mass of Fe(OH)3 = 106.87g/mol

Q: How many millimeters of 11.5 M HCI (aq) are needed to prepare 195.0 mL of 1.00 HCI (aq)?  V= ? mL

A: ** Note :- Molarity of HCl is 1.00 M   final volume of HCl= 195 mL final concentration of HCl = 1.00…

Q: Silver sulfate is precipitated from solution according to the following reaction 2 AgNO3…

A: Given: The reaction is as follows: 2 AgNO3 (aq) +  Na2SO4 (aq) --> Ag2SO4 (s) + 2 NaNO3 (aq) From…

Q: Steps (4) Average volume of NaOH used (mL) (5) (6) (7) (8) (9) Description of steps (10) Average…

A:

Q: You are preparing a NAOH solution for use with an acid-base titration experiment. You weighed out…

A: Given ;-  Mass of NaOH = 1.321 g  Volume of solution = 246.9 mL  Molar mass of NaOH = 40.00 g/mol To…

Q: CHEMWORK When the following solutions are mixed together, what precipitate (if any) will form? Note:…

A: To solve this problem we have to complete the given chemical equation .

Q: Calculate the mass of precipitate (in g) produced when 75 mL of 6.00 mol/L sodium hydroxide solution…

A: Given,  Volume of NaOH in mL = 75 mL  Molarity of NaOH = 6.00 mol/L  Calculate the mass of…

Q: You measure 7.47.4 mL of a 50%50% NaOHsolution by weight (its density is 1.53 g mL−1)and dilute it…

A:

Q: During the course of a titration experiment, you notice that no matter how much base you add to the…

A: The objective is to analyze the error in acid-base titration and find the suitable corrective…

Q: Potassium hydrogen phthalate is a solid, monoprotic acid frequently used in the laboratory to…

A: Sodium hydroxide reacts with KHP to form the sodium-potassium phthalate and water. The reaction is…

Q: Suppose you are titrating an acid of unknown concentration with a standardized base. At the…

A: Initial volume reading of the burette = 2.31 mL Final volume reading of the burette = 22.53 mL…

Q: In the laboratory, a student dilutes 15.3 mL of a 6.04 M hydroiodic acid solution to a total volume…

A: Given data :   Initial volume (V1) = 15.3 mL  Initial Concentration = (M1) = 6.04 M   Final volume…

Q: A stock solution will be prepared by mixing the following chemicals together: 3.0 mL of 0.00200 M…

A: Molarity of Fe(NO3)3 used, C = 0.200 M  Volume of 0.200 M Fe(NO3)3 used, V = 10.0 mL

Q: Calcium Chloride (CaCl,) freely dissolves in water by the following equation. 2+ CaCl, (s) → Ca“…

A: We have to find concentration of Cl-

Q: The moles of a substance in solution depends on how much solution there is (the volume) and how much…

A: We use the below formula from part#(a) to find the moles of sodium carbonate in the desired diluted…

Q: The normality of an aqueous solution of hydrochloric acid is determined by titration with a…

A: One mole of barium hydroxide reacts with two mole of hydrochloric acid to form one mole of barium…

Q: A laboratory technician needs to make a 135 liter batch of a 20% acid solution. How can the…

A: Total volume of final acid mixture = 135LFor pure acid,concentration (v/v) = 100%For 10% (v/v)…

Q: A student, performing the same experiment as you, recorded the following information. The original…

A: The balanced reaction of acetic acid v/s NaOH is as follows: CH3COOH+NaOH→CH3COONa+H2O Determination…

Q: color.  What is the concentration of the NaOH solution? The molar mass

A: At equivalent point,  Geq. of NaOH  = Geq. of KHP N1V1 = N2V2 M × 16.8 /1000 = 0.261/204 M = 0.076M

Q: 'm trying to calculate the amount of sucrose in Cola. volume=50mL mass = 54.2060 g Density=…

A: Number of moles of sucrose is equal to the mass of sucrose divided by molar mass of sucrose.

Q: A chemistry student needs to standardize a fresh solution of sodium hydroxide. She carefully weighs…

A: The balanced chemical reaction is given as: H2C2O4 (s) + 2NaOH (aq) → Na2C2O4 (aq) + 2H2O (l)…

Q: During the standardization of NaOH , a drop of titrant was present on the tip of the buret when…

A: A titration is a procedure that uses a known concentration of a solution to calculate the…

Q: A stock solution will be prepared by mixing the following chemicals together: 3.0 mL of 0.00200 M…

A: The molarity of any solution can be obtained by diving the moles of its solute by the volume of the…

Q: You used a stock 0.200M solution of CuSO4 for constructing a calibration curve. Assuming the density…

A:

Q: Stock hydrochloric acid (HCI) has a concentration of 12.1 M. What volume of concentrated HCI, in mL,…

A: Dilution :  Addition of solvent to the solution is called dilution  In dilution process number of…

Q: You add the weighed KHP to a flask containing a 60mL of water rather than 50 mL of water. Explain.…

A: Molarity of NaOH is calculated using standard KHP solution(with known concentration) as follows:…

Q: 5.00 ml of 7.35 M Fe(NO3)3 is combined with 1.00 mL of 0.50 M HCIO4 and 4.00 ml of 2.00 × 10-2 M…

A: Given: Vol of  Fe(NO3)3 = 5.00 mL Concentration [Fe(NO3)3 ] = 7.35 M Vol of HClO4 = 1.00 mL…

Q: 3NaOH= H3PO4----> Na3PO4+ 3H20 A 41.0ml sample of NaOH solution of unknown concentration requires…

A: Given, 24.3 mL of 0.150M  H3PO4 no. Of moles of H3PO4= 0.0243 L × 0.150M No. of moles of H3PO4 =…

Q: < Question 10 of 12 2 What mass of precipitate (in g) is formed when 52.3 mL of 0.500 M FeCl3 reacts…

A:

Q: What mass of  NaHCO3  would he need to ingest to neutralize this much  HCl

A: Molarity = number of moles/volume of solution (in L)  number of moles = mass/molar mass

Q: In the next part of the experiment, you used the standard solution of sodium oxalate to standardize…

A: The data given is,

Q: Using the solution Pb(NO3)2(aq) at 2x10-3 mol/L, and Na2SO4(aq) at 2x10-3 mol/L: - give the chemical…

A:

Precipitation Titration

Precipitation analysis is used to analyze drugs, and to measure the salt content in food and beverages. It is an important concept from the examination point of view many practical questions are asked on the topic. This topic is significant in the professional exams for both undergraduate and graduate courses, especially for