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What does M stand for in chemistry? [Copy URL]

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Post time 2013-2-21 20:44:08 |Show all posts

I have a question that says: What is the pH of a solution in which the hydroxide ion concentration is 0.130M? I think M is the same as mol/L but I'm not sure and would like to know so I don't screw anything up on my test in a few days. Also, I know molar mass is usually M but I don't think that's what it means in the context of this question.

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Post time 2013-2-21 20:44:10 |Show all posts

M stands for Molarity.

Now you may wonder, what is Molarity ?
The answer lies in its unit which is moles/liter. Hence we can define molarity as the number of moles of solute dissolved per litre of the solution. Molarity is a physical quantity and represents the concentration of a solution in moles per liter.

So, Molarity = No of moles of Solute / Volume of Soln in liters

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Post time 2013-2-21 20:44:11 |Show all posts

'M' is 'molar' or moles per litre. Usually written as mol*dm^-3 or mol/dm^3
The old fashioned way is 'mol*l^-1' or mol/L.

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Post time 2013-2-21 20:44:12 |Show all posts

M in this context does stand for Molar/moles per Litre.

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