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Which of the following should bie done f...

Which of the following should bie done for preparing 0.4 M NaCl starting with '100 mL' of 0.3 M NaCl (mol. wt. of NaCl 58.5)

A

add '5.85 NaCl'

B

add '20 mL H_2 O'

C

add '0.010 mL NaCl'

D

evaporate '10 ~mL' water '

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The correct Answer is:
A
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