Your laboratory instructor may ask you to consult a reference source in which la

Question

Your laboratory instructor may ask you to consult a reference source in which laboratory technique are discussed, in order to answer the following questions and perform the experiment. (a) After preparing a dilute sodium hydroxide solution in a volumetric flask, you notice that the meniscus of the solution is above the 100.0-mL mark on the flask neck. What should you do? (b) The figure below shows a portion of a 50.00-mL buret containing sodium hydroxide solution remaining at the end of a titration. What final solution volume should be recorded? Write a balanced chemical equation for the reaction of acetic acid and sodium hydroxide solution Indicate the physical state of each reactant and product, using the following abbreviations (aq) for aqueous solution, (s) for solid, (f) for liquid, and (g) for gas. What volume of 5.000 M sodium hydroxide is needed to prepare 100.0 mL of a 0.5000M sodium hydroxide?

Explanation / Answer

Q3

a)

You should release some NaOH solution, so it gets to the level of V = 100 mL

b)

We must record the lowest point of the meniscus

so

choose: 16.5 mL NOT 16.4 mL

Q4

Acetic acid = CH3COOH

sodium hdroxde = NaOH

CH3COOH(aq) + NaOH(aq) --> H2O(l) + NaCH3COO(aq)

Q5.

since ratio is 1:1

then

mmol of acid = mmol of base

100*0.5 = 5*V

V = 100/5*0.5

V = 10 mL required

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