<p>This is the chemistry one from Kaplan.</p>
<p>What volume of water should be needed to dilute 50mL of 3M HCl solution to 1M?
A) 25 mL
B) 50 mL
C) 75 mL
D) 100 mL
E) 150 mL</p>
<p>Which one? Show your explanation.</p>
<p>I think E.</p>
<p>Always use the equation (Molarity)(Volume)=(Molarity)(Volume). Make sure if one side is in mL, the other is too. For example, don't do 1L and 10mL, do 1000mL and 10 mL)</p>
<p>Using that, you write
(3)(50)=(1)(Volume)</p>
<p>Volume= 150mL</p>
<p>If I am wrong then someone tell me. I always feel weird answering the question first lol.</p>
<p>soo doesnt that mean you need to add 100mL since the total volume is 150mL and you already have 50mL of the solution?
im not 100% sure..</p>
<p>yea i thought it was E too...because it doesn't ask how much should be ADDED...it just says how much is needed..</p>
<p>so i think what theman66 did is correct.</p>
<p>yeah that is tricky..
you definitely NEED 150 mL,
but is it asking for how much you need to add or how much you need in the end?
poorly worded?</p>