Question

Pour 30 grams of salt into a solution. Calculate the weight percentage concentration of this solution if the solution weighed 250. g. Dilute this solution 7 times. Calculate the concentration of each solution, assuming that each dilution represents a 10:1 decrease in concentration. Record this in the Table. How many grams of salt are in each solution? Record this in the Table. How many NaCl formula units are there in each of the solutions? Hint: 58.5 g of NaCl contains 6.02 x 1023 formula units of salt. Record this in the Table.

This is part of a home experiment. I do not have the table attached. Thanks for the help!

Answer #1

Calculation for first solution after each dilution calculation method will remain same

Given 30gm salt poured in a solution of weigh 250gm

Then weight percentage concentration(%w/w) = 30/250*(100) = 12%

58.5gm of NaCl conatians 6.02 x 10^{23}(N_{A})
formula units of salt

So 30gm of NaCl(salt) will contaion = 30/58.5(N_{A}) =
0.51N_{A}

dilution for first time

C2 = C1/10 = 1.2 %

NaCl formula units

It clear that we are only diluting the solution so amount of water will decrease but grams of salt will remain same then formula unit also remain same(only adding water to dilute the solution)

Serial No. Concentration(c%) | Grams of salt | Formula units of salt |

1. 12 | 30 | 0.51N_{A} |

2. 1.2 | 30 | 0.51N_{A} |

3. .12 | 30 | 0.51N_{A} |

4. 0.012 | 30 | 0.51N_{A} |

5. 0.0012 | 30 | 0.51N_{A} |

6. 0.00012 | 30 | 0.51N_{A} |

7. 0.000012 | 30 | 0.51N_{A} |

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