Calculate SO42- Concentration in Mixture of Na2SO4 & Al2(SO4)3

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SUMMARY

The discussion focuses on calculating the concentration of sulfate ions (SO42-) in a mixture of sodium sulfate (Na2SO4) and aluminum sulfate (Al2(SO4)3). The final solution is derived from 311 mL of 0.500 M Na2SO4 and 190 mL of 0.300 M Al2(SO4)3. The moles of Na2SO4 are calculated to be 0.1555, while the moles of Al2(SO4)3 are 0.057. Each mole of Al2(SO4)3 contributes three moles of sulfate ions, leading to a total concentration of SO42- ions that can be calculated from the combined moles of sulfate from both salts.

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Homework Statement


hey i really can't do this question, can anyone help. A mixture was made from solutions of sodium sulfate and aluminium sulfate.
311 mL of 0.500 M Na2SO4 solution and 190 mL of 0.300 M Al2(SO4)3 solution were mixed together. Calculate the concentration of SO42- ions in the final solution?


anyhelp would be appreciated. thanks



The Attempt at a Solution

 
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How many moles of Na2SO4 ? How many moles of SO4 does each mole of the salt have?

How many moles of Al2(SO4)3 ? How many moles of Sulfate does each mole of this salt have?
 
moles of Naso4=0.1555
moles of Al(So4)3=0.057

How do i work out the number of moles of So4 ions?
 
Al2(SO4)3 - how many Al3+ per molecule? How many SO42- per molecule?

Al2(SO4)3 - how many moles Al3+ per mole of salt?
 
2 Al /molecule 3 SO4molecule.
im not sure if this is right--mole of al=26.98/(26.98x2)+(3x32.02)+(12x16)=0.0788mol?
 
No, no need for molar masses.

Mole is just an ovegrown dozen.

If there is one exhaust in car, how many exhausts in dozen cars?

If there is one exhaust in car, how many exhausts in mole of cars?
 

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