Answer to Question #63875 in General Chemistry for ali jamal abu elrub

Question

1-suggest a reason for titrating only when the solutions are hot?

2-what is the mass in grams of 3.6 equivalents of calcium oxalate?

3-what type of indicator would you use for the redox titration of potassium permanganate and fe+2 ion?

Answer 1

. Since, the solubility depends on temperature. The higher the temperature the greater the solubility. Titration hot solution helps to avoid precipitation.
2. Atomic weights: Ca=40 g/mol, C=12 g/mol, O=16 g/mol, CaC2O4=128 g/mol
CaC2O4 contains Ca2+ and C2O42-, so there are two equivalents in a mole. 3.6 x 64 = 230.4 g
3. Oxidation of Fe2+ by permanganate is one of the most popular titrations. Pink color of excess permanganate is strong enough so that there is no need for any other indicator