# chemistry

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How to calculate PH 1.9 =0.0126M
I do not still understand. I want you step by step to calculate for me.

Thank you.

• chemistry -

I do these this way.
pH = -log(H^+)
1.9 = -log(H^+)
-1.9 = log(H^+).
Now enter -1.9 on your calculator and hit the 10x key. The answer of 0.01259 will appear.
This is just math. You may have seen it this way.
(H^+)= 10-1.9
Enter 10, then yx key, then -1.9, press = and the answer of 0.01259 will appear.

• chemistry -

the answer is rounded off to 4 significant digits.

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