Try it on paper first. A hint, the key idea and the worked solution are here when you need them.
A zeolite has the formula and a molar mass of . Hard water holds of calcium ions in each litre. Each calcium ion takes the place of two sodium ions of the zeolite. Take and . Find the mass of calcium that of the zeolite can remove. Then find the mass of zeolite needed to soften of the water, and the mass of sodium that goes into the water.
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. Capacity. Six Ca for each formula unit: of calcium for each of zeolite, which is for each gram.
Step 2. Calcium in the water. .
Step 3. Mass of zeolite. .
Step 4. Sodium released. of Ca takes the place of of Na, which is .
Answer: , and .
Check. The charge is the same on the two sides: units of charge leave the water as calcium and enter it as sodium.
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A tetrahedron that shares corners has oxygen atoms and the charge on each silicon. The charges of a mineral add up to zero. A silicone chain unit is . A zeolite exchanges its ions by charge: one Ca takes the place of two Na.