# chemistry

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How many grams of sodium chloride are needed to prepare 250 mL of a 2% solution?

• chemistry -

wouldn't you want .02*250g=5grams?

• chemistry -

find the moles of NAOH =250*0.20/1000
no of moles = 0.05
moles=mass/molar mass
so,
mass=moles*molar mass
molar mass of NAOH is =40

so,mass=0.05*40 =2g
mass of NAOH needed is 2g {answer}

3nx ...

• chemistry -

58/2*100 = 2900 grams

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