20 mL of calcium hydroxide was consumed when it was reacted with 10 mL of unknown solution of . Also 20 mL standard solution of 0.5 M HCl containing 2 drops of phenolphthalein was titrated with calciu

Question

20 mL of calcium hydroxide was consumed when it was reacted with 10 mL of unknown solution of . Also 20 mL standard solution of 0.5 M HCl containing 2 drops of phenolphthalein was titrated with calcium hydroxide, the mixture showed pink colour when burette displayed the value of 35.5 mL whereas the burette showed 25.5 mL initially. The concentration of  is  M. (Nearest integer)

Canvas Classes · Accepted Answer

Step 1 — Find concentration of :

Volume of  used =  mL

Reaction:

Moles of HCl =  mol

Moles of  =  mol

Step 2 — Find concentration of :

Reaction:

Moles of  used =  mol

Moles of  =  mol (1:1 ratio)

Answer: 1 M

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