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When you are given a concentration for a compound, such as 1 M NaCl, it indicates...

When you are given a concentration for a compound, such as 1 M NaCl, it indicates the number of moles of formula units per liter (formula-unit concentration).

By multiplying the formula-unit concentration by the number of ions per formula unit, you arrive at the ion concentration.

For example, a 1 M solution of NaCl has a 2 M ion concentration (1 M of Na+ ions and 1 M of Cl− ions) because there are two ions per formula unit of NaCl. A 1 M solution of Na2S has a 3 Mion concentration (2 M of Na+ ions and 1 M of S2− ions) because there are three ions per formula unit of Na2S.

Part B

What is the concentration of K+ ions in a 0.025  M K2CO3 solution assuming complete dissociation?

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Answer #1

There are 2K and1CO per formula unit of K,CO, i.e. 1 molecule of K,CO, on complete dissociation gives 2 molecules of K and1 molecule of CO So, calculate the total K. ions concentration in 0.025 M K,CO, solution as follows: ion concentation -no. of ions per formula unit x formula unit concentration ion concentration = 2×0.025 M 0.050 M Hence, the concentration of K ions in the 0.025 M K2CO is 0.050 MM.

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