Which of the following should be done in order to prepare 0.40 M NaCI – InterviewSolution

1.	Which of the following should be done in order to prepare 0.40 M NaCI starting with 100 ml of 0.30 M NaCI (Mol. Mass of NaCI = 58.5)?
Answer» Add 0.585 g NaCl Add 20 ml water Add 0.010ml NaCl Evaporate 10ml water Solution :100 ml. of `0.30 M =(100xx0.3)/(1000)=0.03` mole of NaCl 100 ml of `0.40 M =(100xx0.4)/(1000)=0.04` mole of NaCl MOLES of NaCl to be ADDED = 0.04-0.03 =0.01 mole = 0.585 GM

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