Textbook formula

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Jasmin Argueta 1K
Posts: 69
Joined: Fri Sep 28, 2018 12:16 am

Textbook formula

I've been reading over section G in the 7th edition and came across the formula m=cMV. I understand all prior formulas but can't conceptualize how this one was derived. It states "First write n=m/M, then the equation 2a(n=cxV) becomes m/M=cV, and therefore, after multiplying both sides by M, you get m=cMV". The last quote is where got confused. An explanation of what each symbol stand for what also be helpful. Hope someone can help thanks!

Andonios Karas 4H
Posts: 30
Joined: Fri Sep 28, 2018 12:27 am

Re: Textbook formula

In this equation m = cMV, m = mass of solute, c = molarity of solution, M = molar mass of the solute, and V = volume of the solution. I see how this equation can be confusing when we usuall use the capital M to denote molarity of the solution. The equation is used to solve for the mass of solute needed when the molarity, molar mass, and volume is known.

The equation $n = \frac{m}{M}$ is calculating the number of moles of solute and is what is substituted into the equation n = cV

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