Name Haley oyle 20yle Sec. QUESTIONS 1. Why must the Erlenmyer flask and graduated cylinder be dried in an oven before the reaction is run? a. Write an equation showing why the crude aspirin dissolves in the saturated NaHCO3 solution. b. Write an equation showing why the aspirin precipitates from when HCl is added to the saturated NaHCO3 solution.

Name Haley oyle 20yle Sec. QUESTIONS 1. Why must the Erlenmyer flask and graduated cylinder be dried in an oven before the reaction is run? a. Write an equation showing why the crude aspirin dissolves in the saturated NaHCO3 solution. b. Write an equation showing why the aspirin precipitates from when HCl is added to the saturated NaHCO3 solution.

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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2. Do the following calculations:a) Calculate the experimental % hydrolysis for 1 M NaC2H3O2 and 1 M Na2CO3 .(experimental means you can only use your measurements- do not look up any K values)b) Calculate the theoretical % hydrolysis for 1 M NaC2H3O2 and 1 M Na2CO3(these are done using published K values)c) Calculate % error or % difference between experimental and theoretical % hydrolysis values. Data: Part 1 1M of: NaCH3CO2 ph=8.79 NaCl ph = 6.89 NH4Cl ph=5.06 NH4CH3CO2 ph = 6.90 Na2CO3 ph=11.82 Part 2 NH4Cl(s) - smell weak NH4CH3CO2 (s)- smell medium (NH4)2CO3(s)- smell strong Part 3 0.1 M NaH2PO4 ph=8.56 0.1 M Na2HPO4 ph=4.65 Part 4 2g of Al2(SO4) (s) + 10 ml H2O (50 ml beaker) ph = 7.96 2g NaHCO3(s) + 10 ml H2O (50 ml beaker) ph = 3.07
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Which among the statements to promote large precipitates is INCORRECT? Having a dilute solution will keep supersaturation ratio small. Temperature affects particle size during crystal growth. The order of addition of the precipitating reagents may affect induction period. It is better to have a faster rate of nucleation than the rate of crystal growth.
This series demonstrates a progression as 0.5 M solution of sodium carbonate (?? ?? ) as it is added drop-by-drop to a test tube containing 0.2 M solution of lead (II) nitrate (??(?? ) ) 1. What observations indicate that a chemical reaction has occurred? 2. Break up the reactants into ions. Switch the cations. Use the “criss-cross” method to get the balanced formulas for the products. Write the balanced molecular equation for this reaction, including phase labels. 3. Write the complete ionic equation for this reaction. 4. Write the net ionic equation for this reaction. 5. What is the precipitate?
QUESTION 2 A small von Weirman ratio is desirable, therefore it is advisable to form a precipitate by I. stirring reagents II. faster addition of reagents II. highly dilute solution by addition of dilute reagents IV. precipitation from cold solution O II & IV O I& II O Il only O I& II O I only
Also tell which pricipitate is formed and next logical caution to remove ?
3
3. Write an equation showing the dissolution reaction for each of the precipitates that was soluble in CH3COOH solution.
How would the solid AgOH (came from KOH) solubility be affected when hydrochloric acid is added?
A. .Sodium tetraphenylboron is the titrant for what precipitimetric method. B.
Can you please answer the question? Thank you
Addition of manganses chloride to a saturated solution of silver (I) chloride causes a/an _______ in mass of precipitate due to _________ a. increase, shifting towards formation of products b. decrease, shifting towards formation of products c. increase, shifting towards formation of reactants d. decrease, shifting towards formation of reactants