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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
    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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