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JulsSmile [24]
3 years ago
14

i have a 5 M stock solution of kcl and i need a 400mM working concentration (1x). if i want to make a 10 ml of a 2x concentratio

n, how much 5 M stock and how much water do i need to add together
Biology
1 answer:
Lyrx [107]3 years ago
7 0

<u>Answer:</u>

<em>8.4 ml of water is needed to make a 10 ml of a 2x concentration.</em>

<u>Explanation:</u>

<em>From question,</em>

<em>M1= 5M,</em>

<em>M2= 400mM \times 2 (2 \times solution) =0.8M,</em>

<em>V2= 10ml</em>

<em>V1=  \frac{(M2 \times V2)}{M1}</em>

<em>This gives V1 = 1.6 ml</em>

<em>V1 is the available volume of water in the stock solution. </em>

To obtain 10ml of 2x concentration, the volume of water required is: 10-1.6 =8.4mlof water.

<em>Hence 8.4 ml of water is needed to make a 10 ml of a 2x concentration.</em>

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