The $pH$ of human blood is $7.4$. The $[H^{+}]$ concentration will be:
- A$4 \times 10^{-8} \ M$
- B$2 \times 10^{-8} \ M$
- C$4 \times 10^{-4} \ M$
- D$2 \times 10^{-4} \ M$
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