Two solutions A and B, each of 100 L was made by dissolving 4 g of NaOH and 9.8 g of in water, respectively. The pH of the resultant solution obtained from mixing 40 L of solution A and 10 L of solut

Question

Two solutions A and B, each of 100 L was made by dissolving 4 g of NaOH and 9.8 g of  in water, respectively. The pH of the resultant solution obtained from mixing 40 L of solution A and 10 L of solution B is .

Canvas Classes · Accepted Answer

Step 1 — Concentrations of A and B:

Solution A (NaOH):  mol in 100 L  M

Solution B ():  mol in 100 L  M

Step 2 — Moles in mixture:
Moles NaOH (40 L):  mol
Moles  (10 L):  mol  = 0.02 mol

Step 3 — Neutralisation:

NaOH needed to neutralise 0.01 mol  = 0.02 mol
Excess NaOH = 0.04 − 0.02 = 0.02 mol

Step 4 — :
Total volume = 50 L

Answer: 10.6

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