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Question:

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

  1. 75M

1.00M

0.975M

0.875M

Solution:

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 =Moles/Volume=0.875/1=0.875M
Hence, the correct option is D.