Asample of calcium carbonate (caco3) is known to contain some impurities. it is found that calcium makes up 11% of the entire mass of the sample. all of the calcium comes from the caco3 compound. find the mass percent of caco3 in the sample. set up a ratio and solve.

28.05% is the mass percent of calcium carbonate in the sample.

Explanation:

Suppose in 100 g of sample of impure calcium carbonate

Percentage of calcium in the sample = 11%

Mass of the calcium in the sample = 11% of 100 g =

Moles of calcium =

In 1 mole of calcium carbonate there are 1 mol of calcium .Then in 0.275 moles of calcium will be in :

calcium carbonate

Mass of 0.275 moles of calcium carbonate :

0.275 mol × 102 g/mol =28.05 g

Percentage of calcium carbonate in the sample:

28.05% is the mass percent of calcium carbonate in the sample.

2 acids found on the daily:

-milk (pH level: 6.5) -- consumed through drinking.

-toothpaste (pH level: 6.8) -- used to brush teeth.

2 bases found on the daily:

-hand soap (pH level: 10) -- used to wash hands.

-printing ink (pH level: 9) -- used to print files onto paper, such as printing out school assignments or job resumes.