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anonymous
 4 years ago
a student must prepare 25.00mL of 0.20M HCl for use in an experimnt. Th only solution available is labled 0.75 M HCl. How much of the stock solution should th studnt use in the preparation of the acid required for the experiment?
anonymous
 4 years ago
a student must prepare 25.00mL of 0.20M HCl for use in an experimnt. Th only solution available is labled 0.75 M HCl. How much of the stock solution should th studnt use in the preparation of the acid required for the experiment?

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anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0We can use the dilution equation...\[C_1V_1=C_2V_2\]Where... C1 is the concentration of a species in the first solution V1 is the volume of the first solution C2 is the concentration of the same species in the second solution V2 is the volume of the second solution \[C_1V_1=C_2V_2 \rightarrow V_1=\frac{C_2V_2}{C_1}\]\[V_1=\frac{(0.20M)(25.00mL)}{0.75M}=6.6667mL\ HCl \approx6.7mL\ HCl \]

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0thanks alot once more

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0i thought v1 is the 25ml...so we are trying to find v2

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0Mathematically, it doesn't matter. However, the 0.20M is the solution the student is trying to MAKE, therefore it would be the second solution. You can solve for V_2 similarly and you'll get the same answer.
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