Lab 12: Pre-Lab Assignment Section: Name: of 0.1104 M NaOH is required to fully

Question

Lab 12: Pre-Lab Assignment Section: Name: of 0.1104 M NaOH is required to fully neutralize the am the amount of glycine 1. What volume hydrochloride that will be used in Part 2 of the experiment? ml sample of a 0.1000 M unknown acid solution is titrated with 0.1000 M NaOH. 20.00 Given that the acid is diprotic and its pKa's are 1.90 and 6.70: 2. A (a) Estimate the pH after 10 mL of base are added (b) Estimate the pH after 20 mL of base are added (c) Estimate the pH after 30 mL of base are added (d) Sketch the titration curve and label all points of interest

Explanation / Answer

1) Moles of Glycine Hydrochloride taken = 20 ml x 0.1 M = 2mmoles

NH2CH2COOH.HCl + NaOH --------------> NH2CH2COOH + NaCl + H2O

So 1 mole of Glycine Hydrochloride reacts with 1 mole of NaOH

moles of NaOH required = 2mmoles

Let the volume be V ml

So 0.1104V=2

V = 18.12 ml

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