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July 31, 2014

July 31, 2014

Posted by **Jon** on Monday, September 16, 2013 at 7:55am.

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 -
**Graham**, Monday, September 16, 2013 at 8:20am1)

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 -
**Jon**, Monday, September 16, 2013 at 9:25amI'm actually still confused by this

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