One of the following statements is incorrect: A primary standard should be highly pure, has atmospheric stability and absence of hydrated water O A standard solution should react completely with the analyte without a definite chemical equation Standardization is required when the titrant solution molarity is approximate Back-titration is required when the rate of the reaction slow Titration error is the difference between equivalence point volume and end point volume

One of the following statements is incorrect: A primary standard should be highly pure, has atmospheric stability and absence of hydrated water O A standard solution should react completely with the analyte without a definite chemical equation Standardization is required when the titrant solution molarity is approximate Back-titration is required when the rate of the reaction slow Titration error is the difference between equivalence point volume and end point volume

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Chemistry Laboratory - Determination of Total Water Hardness by Compleximetric Titration
13. Anhydrous sodium carbonate is used as the primary standard to determine the exact concentration of the HCI titrant. Which of the following IS NOT a desirable property of a primary standard? hygroscopic easily weighed chemical purity of greater than 99+% does not decompose or gain weight under normal atmospheric conditions
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A 320.00 mL solution of 0.00290 M AB2 is added to a 260.00 mL solution of 0.00235 M C3D2. What is pQsp for A3D2?
Methods of Spectrophotometric Titration Coulometry Potentiometry Job's Plot Yoe and Jones Method Mole Ratio Continuous Variation Slope Ratio Neutralization
A generic version for Drug X is applying registration to the FDA. For the generic drug to be approved, it must prove bioequivalence with an innovator/originator drug. However, the company registering Drug X is applying for an exemption for in vivo bioequivalence testing. To qualify for this exemption, one of the requirements is to prove that it can be highly soluble in an aqueous buffer of pH 1.2, 4.5, 6.8. As the drug formulator, you need to prepare these buffers to test your sample. 1. For the pH 4.5 buffer, you must use acetic acid and sodium hydroxide: СНЗСООН + NaOH — NaCНЗСОО + Н20 The Ka of acetic acid is 1.8 x 10-5. Using the Henderson-Hasselbalch equation, calculate the molar ratio of [conjugate base]/[weak acid] that must be used in preparing the buffer. А. 0.29 В. 0.57 С. 0.87 D. 1.14 2. The only remaining NaOH in the lab is 100 mL of 1.0 M NaOH solution. Given this amount, how many moles of acetic acid must be used to prepare 1 L of the buffer. A. 0.088 mol B. 0.175 mol C.…
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Data Table 1: Complexometric Titration of Hard Water 6ml of water used (5ml of hard water and 1ml of buffer) Hard Water Trial 1 Hard Water Trial 2 Hard Water Trial 3 Initial Syringe Reading (mL) 1ml 1ml 1ml Final Syringe Reading (mL) 0.55ml .50ml .33ml Volume of EDTA Consumed (mL) 0.45ml .50ml .77ml Water Hardness ppm CaCO3 (mg/L) Average ppm CaCO3 (mg/L): photo shows equation that needs to be used to solve
A student has performed a set of titrations using EDTA as the titrant and a zinc standard solution as the titrate. If the average titre volume was calculated to be 13.91 mL, calculate the % relative uncertainty of there is a ± 0.11 mL absolute uncertainty associated with each titre volume measured in the burette. . 0.8 % 0.11 % 14.02 % 13.80 % 0.008 % 0.1 % 11 %
25.0 cm3 of sodium hydroxide solution is tritrated against 0.200 mol dm–3 hydrochloric acid until the indicator just changes colour. 27.5 cm3 of the acid are required to reach the end point.Which of the following pieces of apparatus should be used to transfer 25.0 cm3 of the sodium hydroxide solution?a. Burette b. Pipette c. Measuring cyclinder d. Volumetric flask