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March 30, 2017

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1.) A biochemistry student wants to make 4 liters of a phosphate solution using 48.6 g Na2HPO4 (FW=141.96) What is the concentration of this solution?

2. When she reaches the storeroom she finds that there is no Na2HPO4, however there is a bottle of hydrate Na2HPO4 * 7H20. (FW=268.07) how many grams of this salt should she use in order to make 4 liters with the same phosphate concentration as above?

  • Chem wondering how to set it up - ,

    1)
    Given:
    V = 4[L]
    m1 = 48.6[g]
    w1 = 141.96[g/mol]
    Use:
    c = m1/(w1*V)

    2)
    Given:
    w2 = 268.07
    Use:
    m2/(w2*V) = m1/(w1*V)
    .: m2 = m1*w2/w1

  • Chem wondering how to set it up - ,

    I'm actually still confused by this

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