1. Determine the concentration of sodium hydroxide using the data from the stand

Question

1. Determine the concentration of sodium hydroxide using the data from the standardization experiment. 2. For each trial with the unknown acid, calculate the following -Trial 2: a) Moles of NaOH required to reach the equivalence point b) Moles of unknown acid in the beaker c) Molar mass of unknown acid -Trial 3: a) Moles of NaOH required to reach the equivalence point b) Moles of unknown acid in the beaker c) Molar mass of unknown acid. 3. From the data for each trial, determine the pKa and calculate the Ka of the unknown acid. Trial 2 Trial 3 4. Determine the average molar mass and Ka of the acid. DATA: 1) Standard NaOH: -mass of KHP= .742 g -Volume of NaOH= 34.81 mL, 18.4 for the second trial. 2) Titration of KHP: -mass of acid= .218 g -volume NaOH= 10.11 mL

Explanation / Answer

mol of KHP = mass/MW = 0.742/204.22 = 0.003633 mol of KHP

ratio is 1:1

so mol of NaOH = 0.003633 mol

[NaOH] 1st = mol/V = 0.003633/(34.81*10^-3) = 0.104366 M of NaOH

for 2nd trial

[NaOH] 2nd = mol/V = 0.003633/(18.4*10^-3) = 0.19744 M of NaOH

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