The answer is The student forgot to add phenolphthalein.
Phenolphthalein<span> is a </span>chemical compound<span> with the </span>formula C20H14O4<span> and is often written as "</span>HIn" or "phph<span>" in shorthand notation. Phenolphthalein is often used as an indicator in </span>acid–base titrations<span>. For this application, it turns colorless in </span>acidic<span> solutions and pink in </span>basic <span>solutions.</span>
1) 1
2)1600
3)0.109
4)0.250
5)14000
6)1000
7)4.8
8)0.027
9)0.198
10)0.075
11)0.50
12)5000
13)1.6
14)65000
15)25
16)0.355
17)0.08
18)63
19)560
20)260
21)0.0565
22)0.0275
23)9.23
24)2500
It was fun!
Lol. It is now a solution and not really inseparable, so your only logical option would be to throw it away and try again.
The formula of the missing component are a follows
HBr + KOH ------> KBr + H2O
H2SO4 + 2NH4OH--------> (NH4)2SO4 + 2H2O
2HNO3 + Mg(OH)2 ---------> Mg(NO3)2 + 2 H2O
