# Calculate the mass of the chalk that contains impurities?

##### 1 Answer

The equation is.....

I get a purity of

#### Explanation:

We need to work out

Now this quantity

We need

And thus given the 2:1 stoichiometry of the carbonate reaction, there were

i.e. a mass of

And thus

We have assume that the impurities were NOT basic, which would skew the results. Please go over my calculations, and point out any errors or misapprehensions (all care taken but no responsibility admitted!). If there is a step which I have glossed over or ignored, please point it out.