We’re asked to determine which will contain the greater number of moles of potassium ion, K+ for the given solutions.
To do so, we need to do these steps:
Step 1: Determine the moles of K2CrO4 and moles of K3PO4 for each solution
Recall that molarity is the ratio of the moles of solute and the volume of solution (in liters).
In other words:
Step 2: Determine the # of moles K+ for each solution by doing a mole-to-mole comparison
The flow of the solution will be like this:
molarity solution (volume solution) → moles solute (mole-to-mole comparison)→ moles K+
Which will contain the greater number of moles of potassium ion: 30.0 mL of 0.15 M K2CrO4 or 25.0 mL of 0.080 M K3PO4?
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What scientific concept do you need to know in order to solve this problem?
Our tutors have indicated that to solve this problem you will need to apply the Molarity concept. You can view video lessons to learn Molarity. Or if you need more Molarity practice, you can also practice Molarity practice problems.
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Based on our data, we think this problem is relevant for Professor Noveron's class at UTEP.