Posted by **Fai** on Sunday, July 29, 2012 at 1:09pm.

Calculate the PH concentrated hydrochloric acid if this solution is 24.8% HCL by weight and has a density of 1.16g/ml. I do not understand the right answer 0.90PH Why? Please help

My calculation

1.18g/ml x 1000ml x 0.248/36.5 = 7.8M

I cannot do?

- chemistry -
**DrBob222**, Sunday, July 29, 2012 at 2:36pm
I think your 7.8 is ok if you carried it out one more place. I obtained 7.88. Then pH = -log(H^+) = -log(7.88) = 0.8966 which rounds to 0.90 to two s.f.

- chemistry -
**Fai**, Sunday, August 5, 2012 at 3:45pm
A solution of sodium cyamide nacn has a ph of 12.10. How many grams of nacn are in 425ml of solution with the same PH

Who helps me to solve it for me. Step by step

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