Question

What is an example of a stoichiometry of reactions between ions in solutions practice problem?

Answer 1

Many example can be given for for stoichiometry reaction between
ions in solution

1. Reaction of strong acid with strong base. for example take 10 mL of 0.1 M HCl, `H_2SO_4`, `HNO_3` titrate with 0.1 M sodium hydroxide. Calculate the volume of sodium hydroxide for neutralisation of acid with base.

HCl + NaOH = NaCl+ `H_2O` Eq 1

One mole HCl = one mole NaOH

`HNO_3 + NaOH = NaNO_3 + H_2O` Eq 2

one mole #HNO_3 = one mole

`H_2SO_4 + 2NaOH = Na_2SO_4 + 2 H_2O`Eq 3

One mole `H_2SO_4` = 2 mole NaOH

For equation 1 & 2 10 mL of sodium hydroxide will be consumed, whereas for eq 3 20 mL of sodium hydroxide is consumed

1. Precipitation reaction

100 mL of 0.1 M `Ca(NO_3)_2 and Zr (NO_3)_4` present in separate reaction vessel are reacted with 0.1 M oxalic acid calculate the volume oxalic acid for precipitation of Ca and Zr as their oxalates

`Ca(NO_3)_2 + H_2C_2O_4 = CaC_2O_4 +2 HNO_3` Eq 4
`Zr(NO_3)_4 + 2H_2C_2O_4 = Zr (C_2O_4)2 +4 HNO_3` Eq 5
Eq 4 One mole Ca = one mole Calcium oxalate
Eq 4 One mole Ca = one mole of Oxalic acid

Eq 5 One mole Zr = One mole Zr oxalate

Eq 5 One mole Zr = 2 mole oxalic acid

Therefore for Ca precipitation requires 100 mL, whereas for Zr it requires 200 mL
like this many example can be given for stoichiometry reactions