Define an equivalent for acids and bases. Using the equivalent concepts given in

Question

Define an equivalent for acids and bases. Using the equivalent concepts given in the background information, answer the following questions. Definition: Calculate the equivalent weight for hydrochloric acid and for sulfuric acid? The gram equivalent weight for tartaric acid is 75.0 g/eq. What is the molar mass of tartaric acid? Show the calculation. Normality and molarity units are easily interchanged. What is the normality of a 3.00 M H_2SO_4 solution? Show how you determined the answer. Explain why is N_1V_1 = N_2V_2 ALWAYS true but why M_V_1 = M_2V_2 is NOT always true?

Explanation / Answer

2.

a. Equivalent is mass of acid or base that has one equivalent of H+ or OH- in it. A monoprotic acid or base has equivalent weigt equal to its mole mass.

b. Equivalent weight of HCl (with one H+) = 36.45 g

Equivalent weight for H2SO4 (with 2 H+) = 98.079/ = 49.04 g/mol

c. Tartaric acid is diprotic acid,

Molar mass of Tartaric acid = Equivalent mass of Tartaric acid x 2 = 75 x 2 = 150 g/mol

d. Normality = molarity x equvalent fator

equivalent factor for diprotic H2SO4 = 2

So, normality = 3.00 M x 2 = 6.00 N H2SO4

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