Question

A hard water sample contains 0.0085% Ca by mass (in the form of Ca2+ ions). How much water (in grams) contains 1.2 g of Ca?

Answer 1

Answer : The amount of water present in 1.2 grams of calcium is,
`1.4* 10^4` grams

Step-by-step explanation :

As we are given that a hard water sample contains 0.0085% Ca by mass that means, 0.0085 grams of calcium ion in 100 grams of water.

Now we have to determine the amount of water in 1.2 grams of calcium ion.

As, 0.0085 grams of calcium ion present in 100 grams of water

So, 1.2 grams of calcium ion present in
`(1.2)/(0.0085)* 100=1.4* 10^4` grams of water

Therefore, the amount of water present in 1.2 grams of calcium is,
`1.4* 10^4` grams

Answer 2

`100\%:0.0085\%=x:1.2 \\0.0085\%x=1.2*100\% \\ \\x= (1.2*100\%)/(0.0085\%) \\ \\x=14,117.65\text{ g}`