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ArbitrLikvidat [17]
3 years ago
15

If you are going to measure the mass of your dog, which of the following units should you use?

Chemistry
1 answer:
erastova [34]3 years ago
8 0
You would use kilograms
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The ka of hf is 6.8 x 10-4. what is the ph of a 0.35 m solution of hf?
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When the reaction equation is:

HF ↔ H+   +   F-

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when we assume:

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So, by substitution:

6.8 x 10^-4 = X^2 / (0.35 - X) by solving for X

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∴[H+] = X = 0.015

when PH = -㏒[H+]

∴PH = -㏒0.015

        = 1.8
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