Which of the following should be done in order to prepare 0.4M NaCl starting with 100ml of 0.3M NaCl?

Question: Which of the following should be done in order to prepare 0.4M NaCl starting with 100ml of 0.3M NaCl?

1.add 5.85g of NaCl

2.and 20ml water

3.add 0.01 mol NaCl

4.evaporate 10ml of water


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