When 0.078 moles of aluminum sulfate are dissolved in enough water to make 634 milliliters of solution, what is the molarity of sulfate ions? Answer in units of M.
The definition is all you need. M = moles/L of solution.
To calculate the molarity of sulfate ions in the solution, we need to convert the given volume from milliliters to liters and then divide the moles of sulfate ions by the volume.
1. Convert the volume from milliliters to liters:
634 milliliters = 634 / 1000 = 0.634 liters
2. Calculate the molarity of sulfate ions:
Molarity (M) = Moles of solute / Volume of solution (in liters)
Given that there are 0.078 moles of aluminum sulfate in the solution, we need to determine the moles of sulfate ions.
The chemical formula for aluminum sulfate is Al2(SO4)3. From the formula, we can see that there are three sulfate ions (SO4^2-) for every one aluminum sulfate (Al2(SO4)3) molecule.
Therefore, the number of moles of sulfate ions = 3 * 0.078 moles = 0.234 moles
Now we can calculate the molarity of sulfate ions:
Molarity of sulfate ions = Moles of sulfate ions / Volume of solution
= 0.234 moles / 0.634 liters
≈ 0.369 M (rounded to three decimal places)
Hence, the molarity of sulfate ions in the solution is approximately 0.369 M.
To find the molarity of sulfate ions, we need to know the number of moles of sulfate ions present in the solution.
The chemical formula of aluminum sulfate is Al2(SO4)3. From the formula, we can see that 1 mole of aluminum sulfate (Al2(SO4)3) contains 3 moles of sulfate ions (SO4^2-).
Given that we have 0.078 moles of aluminum sulfate, we can calculate the number of moles of sulfate ions as follows:
Number of moles of sulfate ions = Number of moles of aluminum sulfate × (3 moles of sulfate ions / 1 mole of aluminum sulfate)
Number of moles of sulfate ions = 0.078 moles × (3 moles / 1 mole)
Number of moles of sulfate ions = 0.234 moles
Now let's calculate the molarity of sulfate ions.
Molarity (M) is defined as moles of solute per liter of solution. We have 634 milliliters of solution, which is equal to 634/1000 = 0.634 liters.
Molarity of sulfate ions = Number of moles of sulfate ions / Volume of solution in liters
Molarity of sulfate ions = 0.234 moles / 0.634 liters
Molarity of sulfate ions = 0.369 M
Therefore, the molarity of sulfate ions in the solution is 0.369 M.