Imagine that you need to perform three titrations (a, b, & c) and you need to de
ID: 814823 • Letter: I
Question
Imagine that you need to perform three titrations (a, b, & c) and you need to determine the appropriate indicator to use. Choose the appropriate indicator for each titration and give a brief explanation for your answer. You have the indicators in Table 1 available (they may be used more than once or not at all).
a. Strong base (like NaOH) with a strong acid (like H2SO4).
b. Ammonia (NH3) with HCl
c. HF with NaOH
Table 1: Indicators
Indicator HIn In- pKa
Terpel Purple Red Blue 4.2
Maryland Red Blue Red 7.4
Terrapin Yellow Red Yellow 10.7
Explanation / Answer
a. Strong base (like NaOH) with a strong acid (like H2SO4).-Maryland Red Blue Red 7.4
b. Ammonia (NH3) with HCl-Terpel Purple Red Blue 4.2
c. HF with NaOH-Terrapin Yellow Red Yellow 10.7