An unknown solid acid is either acetic acid, citric acid or tartaric acid. To de

Question

An unknown solid acid is either acetic acid, citric acid or tartaric acid. To determine which acid you have, you weighed a sample of the acid, dissolved it in water and titrated it with NaOH(aq).

The neutralization reactions for each of the acids are:

acetic acid (molar mass = 60.05): HC2H3O2 (aq) + NaOH (aq) NaC2H3O2 (aq) + H2O(aq)

tartaric acid (molar mass = 150.09): H2C4H4O6 (aq) + 2 NaOH (aq) Na2C4H4O6 (aq) + 2 H2O (aq)

citric acid (molar mass = 192.14): H3C6H5O7 (aq) + 3 NaOH (aq) Na3C6H5O7 (aq) + 3 H2O (aq)

You found that a 1.15 g sample of the unknown acid required 34.85 mL of 0.513 M NaOH solution to reach the titration endpoint. How many moles of H3O+ ions were neutralized?

Explanation / Answer

An unknown solid acid is either acetic acid, citric acid or tartaric acid. To de

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