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photoshop1234 [79]
4 years ago
9

How would you prepare 500 ml of a 0.4 M solution of NaCl?Please explain.

Biology
1 answer:
Amanda [17]4 years ago
3 0

Answer:

Dissolve 11.7 grams of NaCl in 500 ml of water and it will give 0.4 M NaCl solution.

Explanation:

As we know that

molarity =  \frac{number \: of \: moles}{volume \: in \: lters}

Thus the number of moles of NaCl required to form 0.4 molar solution are

number \: of \: moles = molarity \:  \times volume

the volume given is 500 ml

= 500/1000 liter = 0.5 liter

putting the values

=  >  \: moles \: required = 0.4 \times 0.5 \\  \:  = 0.2 \: mol

We also know that one mole of NaCl = 58.5 grams thus 0.2 moles

= 58.5 × 0.2 = 11.7 grams

THUS dissolve 11.7 grams of NaCl in 500 ml of water and it will give 0.4 M NaCl solution.

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