/sci/ - Science & Math » Thread #13420926

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Anonymous Wed 21 Jul 21:01:09 2021 No.13420926 View Reply Original Report

Quoted By: >>13420996 >>13420999 >>13421447

OK mathfags, if you are so smart riddle me this.
Why is V1C1=V2C2 (Eq. used to find a compound's volume or concentration knowing the volume and concentration of a starting compound at different concentrations and/or volumes) not a proportion of the likes of A:B=X:C , where to get X you do (AxC)/B ?
V1C1=V2C2 is literally V1xC1=V2xC2 so if you have V1xX=V2xC2, X is equal (V2xC2)/V1, NOT (V1xC2)/V2 like you would solve a normal proportion.
Why is that? shouldn't it be a proportion?

Anonymous

Anonymous Wed 21 Jul 2021 21:13:09 No.13420970 Report

Quoted By:

to be more clear, the V1C1=V2C2 is used if I have a 50 Mg/ml chemical and I want 1 mL 0,6 mg/L of the same chemical, how much of the 50 Mg/ml chemical do I need to use to have 1 mL 0,6 mg/L?
X=(1x0,6)/50

In short, why is it a basic equation and not a proportion? to me it seems like it should be a proportion

Anonymous

Anonymous Wed 21 Jul 2021 21:18:28 No.13420996 Report

Quoted By: >>13421086

>>13420926
>OP is a dumb nigger who can't into LaTeX
OK mathfags, if you are so smart riddle me this.
Why is $V_1C_1=V_2C_2$ (Eq. used to find a compound's volume or concentration knowing the volume and concentration of a starting compound at different concentrations and/or volumes) not a proportion of the likes of $A:B=X:C$ , where to get $X$ you do $(A\times C)/B$ ?
$V_1C_1=V_2C_2$ is literally $V_1\times C_1=V_2\times C_2$ so if you have $V_1\times X=V_2\times C_2$ , $X$ is equal $(V_2\times C_2)/V_1$ , NOT $(V_1\times C_2)/V_2$ like you would solve a normal proportion.
Why is that? shouldn't it be a proportion?

>answer
Concentration is inversely proportional to volume
$c_1V_1 = c_2V_2 \Leftrightarrow c_1 : c_2 = V_2 : V_1$

Anonymous

Anonymous Wed 21 Jul 2021 21:18:35 No.13420999 Report

Quoted By:

Anonymous

Anonymous Wed 21 Jul 2021 21:43:19 No.13421086 Report

Quoted By:

>>13420996
I see, so it is a proportion after all, but an inverse one

Anonymous

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Anonymous Wed 21 Jul 2021 23:49:51 No.13421447 Report

Quoted By:

>>13420926
>Why is V1C1=V2C2
conservation of mass. if you dilute a solution, the total mass of solute is unchanging. so VC = constant and V1C1=V2C2

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