Textbook formula

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

Textbook formula

Postby Jasmin Argueta 1K » Wed Oct 10, 2018 5:36 pm

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

Postby Andonios Karas 4H » Wed Oct 10, 2018 6:08 pm

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 is calculating the number of moles of solute and is what is substituted into the equation n = cV

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