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xeze [42]
2 years ago
7

1. How much NaCl would you need to weigh out to prepare 100 mL of a 2.5% NaCl solution?

Chemistry
1 answer:
Ira Lisetskai [31]2 years ago
7 0
<h3><u>Answer</u> - 5.85g</h3>

<h3><u>Solution</u> - </h3>

Using the concentration equation, m = CVMo where m is the mass of solute, C is the concentration (M), V is the volume of solution (L) and Mo is molar mass of the solute (g):

Given,

Molar mass of NaCl, M = 58.5g/mol

Volume of the solution, V= 100ml = 0.1L

Molarity, S= 1M

Mass of the solute,W=?

W=SMV

= 1×58.5×0.1

= 5.85g

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