School and Work

A voltaic cell consists of Mn/Mn2+ and Pb/Pb2+ half cells. Calculate the concentration of Pb2+ when the concentration of Mn2+ is 1 M and Ecell is 0.44V.

Please help. I believe you use the equation Ecell = standard-Ecell - ( 0.0592V / n) (log Q), but I cannot get the right answer.

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A 0.11 gram sample of pure barium was added to 100cm^3 of water.

Ba + H20 ---> Ba(OH)2 + H2

Calculate the concentration, in moldm^-3, of the Ba(OH)2 solution formed.

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I am clueless. Please show working, I don't even know where to begin.

The answer is 8 x10^-3 by the way. (In given answers)

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The question asks us to find the original concentration of a substance used in a laboratory experiment.

The amount used was 50 microlitres and the original dilution was a 1 in 500.
What was the original concentration of the chemical?

Thanks so much for any help!!

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could sum1 pleez help me to work out the concentration of salicylic acid in moldm-3.
Its a titration of salicylic acid with KOH and the total volume of KOH added is 34 ml.
Concentration of KOH = 0.10moldm-3
weight of salicylic acid in 1000ml of solution is 1.20g

Thanks in advance!!

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