Chemistry•Hard

Acid-Base Titration

Chemistry challenge: You have 25 mL of 0.10 M HCl. You titrate it with 0.10 M NaOH. Complete the analysis.

Scenario

In your lab you fill the burette with 0.10 M NaOH and the conical flask with 25.0 mL of 0.10 M HCl. The indicator turns from colourless to pink at the equivalence point.

Scored questions

Question 1

How many moles of HCl are in the 25.0 mL flask?

mol

Question 2

What volume of 0.10 M NaOH is needed to reach the equivalence point?

Question 3

What is the pH at the equivalence point of this strong acid–strong base titration?

Question 4

Which indicator is MOST suitable for this titration (equivalence at pH 7)?

Methyl orange (pH 3.1–4.4)Phenolphthalein (pH 8.2–10.0)Bromothymol blue (pH 6.0–7.6)Litmus (pH 5–8)

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