What is the value of carbonate hardness of water sample if 100 mL of it took

What is the value of carbonate hardness of water sample if 100 mL of it took 5 mL of 0.09 N HCl solution ? (Molecular weight of Na₂CO₃ = 106)

Options

(a) 4.50 mg-eq/L
(b) 1.80 mg-eq/L
(c) 0.042 mg-eq/L
(d) 477.00 mg-eq/L

Correct Answer:

4.50 mg-eq/L

Explanation:

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