Limiting Reactant - Ion Concentration In A Potassium Hydroxide-Nickel Sulphate Reaction

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Limiting Reactant - Ion Concentration In A Potassium Hydroxide-Nickel Sulphate Reaction

A solution of 100 mL of 0.200 M KOH is mixed with a solution of 200 mL of 0.150 M NiSO_{4}

(a) What precipitate forms?

(b) What is the limiting reactant?

(c) How many grams of the precipitate is formed?

(d) What is the concentration of each ion that remains in solution?

**The strings**:
S_{7}P_{6}A_{66} (interaction - chemical).

S_{7}P_{1}A_{15} (containership - mass).
**The math**:

Pj Problem of Interest is of type *interaction* (chemical).

**(a)** Chemical equation:

2KOH + NiSO_{4} ------> K_{2}SO_{4} + Ni(OH)_{2}

Precipitate is Ni(OH)_{2}
**(b)** Mol of KOH = (0.100)(0.200) = 0.0200 mol

Mol of NiSO_{4} =(0.200)(0.150) = 0.03 mol

Mole ratio of KOH:NiSO_{4} in balanced equation is 2:1

Mole ratio of KOH:NiSO_{4} in solution is 1:1.5

So, KOH is the limiting reactant.
**(c)** 2 moles of KOH forms 1 mole of Ni(OH)_{2}

So, 0.0200 mol of KOH forms 0.0200/2 = 0.01 mol of Ni(OH)_{2}

Molar mass of Ni(OH)_{2} = 59 + 32 + 2 = 93 g

So, gram of precipitate = 93(0.01) = 0.93 g of Ni(OH)_{2}.
**(d)** From calculations in (b):

Initial mol of KOH = 0.02 mol

So, inital mol of K

So, initial mol of OH^{-} = 0.02

Initial mol of NiSO_{4} = 0.03 mol

So, initial mol of Ni^{2+} = 0.03

So, initial mol of SO_{4}^{2-} = 0.03

Mole of Ni(OH)_{2} in product = 0.01

So mol of N^{2+} in product = 0.01

So, mol of 2OH^{-} = 0.02

So, mol of Ni^{2+} that remain in solution = 0.03 - 0.01 = 0.02 mol

Combined volume of 0.100 L solution of KOH and 0.200 L solution of NiSO_{4} = 0.3 L

So, concentration of Ni^{2+} that remains in solution = 0.02/0.3 = 0.0667 M.

Initial mole of K^{+} remains in solution:

So, concentration of K^{+} that remains in solution = 0.02/0.3 = 0.0667 M.

Similarly, initial mol of SO_{4}^{2-} remains in solution

So, concentraion of SO_{4}^{2-} that remains in solution = 0.03/0.3 = 0.1 M.

Math

The *point* **.** is a mathematical abstraction. It has negligible size and a great sense of position. Consequently, it is front and center in abstract existential reasoning.

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