1M HCI and 2MHClare mixed in volume ratio of 4 : 1. What is the final molarity of HCI solution?

1M HCI and 2MHClare mixed in volume ratio of 4 : 1. What is the final molarity of HCI solution?

A
1.5
B
1
C
1.2
D
1.8

Solution:

$[HCl] = \frac{1 \times 4 V + 2 \times V}{5 V} = 1 .2 M$

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