1.

What weight of sodium hydroxide should be dissolved to prepare 250 ml of 0.2 M solution ?

Answer»

2g
8g
60g
4g

Solution :Molarity `= ("Wt. of NAOH"xx1000)/("MOL. wt." XX "VOLUME")`
`=0.2= ("Wt. of NaOH" xx 1000)/(40xx250)`
or Wt. of NaOH `= (0.2xx40xx250)/(1000)=2 g`


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