4.Suppose you run a titration of an acid yourself. You do it three times be- tween an acid and sodium hydroxide solution. Here is some data: Average volume of sodium hydroxide solution delivered: 9.10 mL Concentration of sodium hydroxide standard solution: 0.1010 M Average mass of acid solution: 9.555 g The average volume of sodium hydroxide solution is the average of three titra- tions. In other words, you did the experiment three times and took an average. The same goes for the average mass of the acid. You ran the experiment three times and the average mass of the acid solution is given for those three titra- tions. The sodium hydroxide solution was standardized and the concentration is given. Show your step-by-step calculations for this experiment to find the mass per- cent of acid in the solution. Show each step explicitly.

4.Suppose you run a titration of an acid yourself. You do it three times be- tween an acid and sodium hydroxide solution. Here is some data: Average volume of sodium hydroxide solution delivered: 9.10 mL Concentration of sodium hydroxide standard solution: 0.1010 M Average mass of acid solution: 9.555 g The average volume of sodium hydroxide solution is the average of three titra- tions. In other words, you did the experiment three times and took an average. The same goes for the average mass of the acid. You ran the experiment three times and the average mass of the acid solution is given for those three titra- tions. The sodium hydroxide solution was standardized and the concentration is given. Show your step-by-step calculations for this experiment to find the mass per- cent of acid in the solution. Show each step explicitly.

Chemistry: Principles and Reactions

8th Edition

ISBN:9781305079373

Author:William L. Masterton, Cecile N. Hurley

Publisher:William L. Masterton, Cecile N. Hurley

Chapter14: Equilibria In Acid-base Solutions

Section: Chapter Questions

Problem 65QAP: Follow the directions of Question 64. Consider two beakers: Beaker A has a weak acid(K a=1105)....

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Explain why the hydrolysis of salts makes it necessary to have available in a laboratory more than one acid-base indicator for use in titrations.
Explain how to choose the appropriate acid-base indicator for the titration of a weak base with a strong acid.
A bottle of concentrated hydroiodic acid is 57% HI by weight and has a density of 1.70 g/mL. A solution of this strong and corrosive acid is made by adding exactly 10.0 mL to some water and diluting to 250.0 mL. If the information on the label is correct, what volume of 0.988 M NaOH is needed to neutralize the HI solution? Suggest an indicator for the titration.
. Which component of a buffered solution is capable of combining with an added strong acid? Using your example from Exercise 60, show how this component would react with added HC1.
Follow the directions of Question 64. Consider two beakers: Beaker A has a weak acid(K a=1105). Beaker B has HCI. The volume and molarity of each acid in the beakers are the same. Both acids are to be titrated with a 0.1 M solution of NaOH. (a) Before titration starts (at zero time), the pH of the solution in Beaker A is the pH of the solution in Beaker B. (b) At half-neutralization (halfway to the equivalence point), the pH of the solution in Beaker A the pH of the solution in Beaker B. (c) When each solution has reached its equivalence point, the pH of the solution in Beaker A the pH of the solution in Beaker B. (d) At the equivalence point, the volume of NaOH used to titrate HCI in Beaker B the volume of NaOH used to titrate the weak acid in Beaker A.
What is a salt? List some anions that behave as weak bases in water. List some anions that have no basic properties in water. List some cations that behave as weak acids in water. List some cations that have no acidic properties in water. Using these lists, give some formulas for salts that have only weak base properties in water. What strategy would you use to solve for the pH of these basic salt solutions? Identify some salts that have only weak acid properties in water. What strategy would you use to solve for the pH of these acidic salt solutions? Identify some salts that have no acidic or basic properties in water (produce neutral solutions). When a salt contains both a weak acid ion and a weak base ion, how do you predict whether the solution pH is acidic, basic, or neutral?
Consider the following six beakers. All have 100 mL of aqueous 0.1 M solutions of the following compounds: beaker A has HI beaker B has HNO2 beaker C has NaOH beaker D has Ba(OH)2 beaker E has NH4Cl beaker F has C2H5NH2 Answer the questions below, using LT (for is less than), GT (for is greater than), EQ (for is equal to), or MI (for more Information required). (a) The pH in beaker A the pH in beaker B. (b) The pH in beaker C the pH in beaker D. (c) The % ionization in beaker A the % ionization in beaker C. (d) The pH in beaker B the pH in beaker E. (e) The pH in beaker E the pH in beaker F. (f) The pH in beaker C the pH in beaker F.
Explain why an acid-base indicator changes color over a range of pH values rather than at a specific pH.
Another way to treat data from a pH titration is to graph the absolute value of the change in pH per change in milliliters added versus milliliters added (pH/mL versus mL added). Make this graph using your results from Exercise 61. What advantage might this method have over the traditional method for treating titration data?
Tartaric acid, H2C4H4O6, has two acidic hydrogens. The acidis often present in wines and a salt derived from the acid precipitatesfrom solution as the wine ages. A solution containingan unknown concentration of the acid is titrated withNaOH. It requires 24.65 mL of 0.2500 M NaOH solution totitrate both acidic protons in 50.00 mL of the tartaric acidsolution. Write a balanced net ionic equation for the neutralizationreaction, and calculate the molarity of the tartaricacid solution.