Interpretation:
The
Concept introduction:
Titrations are recorded with a help of various titration curves, in which the volume of the titrant (known solution) is taken as an independent variable and the
To determine: The
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- Consider the nanoscale-level representations for Question 110 of the titration of the aqueous weak acid HX with aqueous NaOH, the titrant. Water molecules and Na+ ions are omitted for clarity. Which diagram corresponds to the situation: After a very small volume of titrant has been added to the initial HX solution? When enough titrant has been added to take the solution just past the equivalence point? Halfway to the equivalence point? At the equivalence point? Nanoscale representations for Question 110.arrow_forwardA buffer is made using 100.0 mL of 0.100 M CH;CH,COOH (propanoic acid) and 100.0 mL of 0.100 M NaCH;CH,COO (sodium propanoate). A) Explain in your own words what will occur (at the molecular level) when an nitric acid is added to the buffer? What would be the effect on the pH? B) Explain in your own words what will occur when LIOH is added tot he buffer? What would be the effect on the [H+]?arrow_forwardEqual quantities of 0.010M solutions of an acid HA and a base B are mixed. The pH of the resulting solution is 9.4 Part A:Write the equilibrium equation for the reaction between HA and B. Express your answer as a chemical equation. Identify all of the phases in your answer. Part B: Write equilibrium-constant expression for the reaction between HA and B. Part C: If Ka for HA is 8.0×10−5, what is the value of the equilibrium constant for the reaction between HA and B? Express your answer using one significant figure. Part D: What is the value of Kb for B? Express your answer using one significant figure.arrow_forward
- A chemistry graduate student is given 100. mL of a 0.80M ammonia (NH,) solution. Ammonia is a weak base with K,=1.8 × 10 °. What mass of NH,Cl 9. should the student dissolve in the NH, solution to turn it into a buffer with pH =9.27? You may assume that the volume of the solution doesn't change when the NH,Cl is dissolved in it. Be sure your answer has a unit symbol, and round it to 2 significant digits. alo Ar x10arrow_forwardA buffer system is prepared by combining 0.603 moles of ammonium chloride (NH4CI) and 0.713 moles of ammonia (NH3). What will the solution pH be if 0.239 moles of the nitric acid (HNO3) is added to the solution. Nitric acid is a strong acid. The K₁ of ammonia is 1.8 x 10-5. (Two decimal places)arrow_forwardDescribe the pH changes that occur during the titration of a weak base by a strong acid. What is meant by the term equivalence point?arrow_forward
- Buffer capacity refers to the amount of acid or base a buffer can absorb without a significant pH change. It is governed by the concentrations of the conjugate acid and base components of the buffer. A 0.5 M buffer can "absorb" five times as much acid or base as a 0.1 M buffer for a given pH change. In this problem you begin with a buffer of known pH and concentration and calculate the new pH after a particular quantity of acid or base is added. 4. You are given 60 mL of 0.50 M phosphate buffer, pH = 6.83, to test. The starting composition of the buffer, both in terms of the concentration and the molar quantity of the two major phosphate species, is: Concentration of HPO,²: 0.304 M Molar quantity of HPO,: 18.2 mmol Concentration of H,PO*: 0.196 M Molar quantity of H,PO = 11.8 mmol You add 1.7 mL of 1.00 M HCl to the buffer. Calculate the molar quantity of H,O* added as HCl, and the final molar quantity of HPO, and H,PO,¯ at equilibrium. a. b. What is the new HPO/H,PO,¯ ratio, and the…arrow_forwardA chemistry graduate student is given 300. mL of a 1.40M ammonia (NH, solution. Ammonia is a weak base with K, =1.8 × 10 °. What mass of NH, Br -5 should the student dissolve in the NH, solution to turn it into a buffer with pH =9.81? You may assume that the volume of the solution doesn't change when the NH,Br is dissolved in it. Be sure your answer has a unit symbol, and round it to 2 4 significant digits. x10 Explanation Check Accessibili 2022 McGraw Hill LLC. All Rights Reserved. Terms of Use Privacy Center MacBook Proarrow_forwardA series of carbonic acid or carbonate buffers regulate pH in blood within the human body. The kidneys and the lungs work together to help maintain a blood pH of 7.4 by affecting the components of the buffers in the blood. What conjugate acid/base pair is the main component in the buffer? Write out the chemical reaction that the conjugate pair undergoes in water. What is the ratio of the acid to the base? What is the ideal pH range for this buffer? Is the pH of blood within the ideal range of the buffer? If it is not, what is the physiological reason that the body would have for still using a carbonate buffer as opposed to another conjugate pair?arrow_forward
- consider the titration of 50.0 mL of 0.10 M acetic acid with NaOH. drag and drop each amount of NaOH added (to the acetic acid) Into the appropriate resulting pH. In other words, determine the pH of the final solution after each volume of NaOH has been added. Will the resulting solutions be acidic, basic, or neutral? Consider the stration of 50.0 ml of 0.10 M acetic acid (HC₂H₂O₂. K, -18 x 10) with NaOH. Drag and drop each amount of NaOH added to the acetic acid) into the appropriate resulting pH. In other words determine the pH of the final solution after each volume of NaOH has been added. Will the resulting solution be acidic, basic, or neutra? Acidic Neutral Basic Drag and drop your selection from the following list to complete the answer 25.0 mL (total) of 0.10 M NaOH has been added (the halfway point) 50.0 mL. (total) of 0.10 M NaOH has been added (the equivalence point) 10.0 mL (total) of 0.10 M NaOH has been added 60.0 mL (total) of 0.10 M NaOll has been added No NaOH has been…arrow_forward3. A formic acid buffer is prepared with 0.010 M each of formic acid (HCOOH) and sodium formate (NaCOOH). The Ka for formic acid is 1.8 x 104. What is the pH of the solution? What is the pH if 0.0020 M of solid sodium hydroxide (NaOH) is added to a liter of buffer? What would be the pH of the sodium hydroxide solution without the buffer? What would the pH have been after adding sodium hydroxide if the buffer concentrations had been 0.10 M instead of 0.010 M? eit afarrow_forwardA chemistry graduate student is given 300. mL of a 0.90M ammonia (NH,) solution. Ammonia is a weak base with K,=1.8 × 10 ° 5 What mass of NH,Br should the student dissolve in the NH, solution to turn it into a buffer with pH = 8.92? %3D You may assume that the volume of the solution doesn't change when the NH,Br is dissolved in it. Be sure your answer has a unit symbol, and round it to 2 significant digits. x10arrow_forward
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