Question

The molarity of a solution obtained by mixing 750 $mL$ of $0.5MHCl$ with 250 $mL$ of $2MHCl$ will be :

• A. 1.00 $M$
• B. 1. 75 $M$
• C. 0.975 $M$
• D. 0.875 $M$

Answer 1

The correct option is D 0.875 $M$

750 ml of 0.5 M HCl have 0.375 moles.

250 ml of 2 M HCl have 0.5 moles.

Total moles $=0.875moles$

Total volume $=750+250=1000ml=1L$

Molarity = $\frac{Moles}{Volume}=\frac{0.875}{1}=0.875M$

Hence, the correct option is D.