To prepare a 10% bleach solution for disinfecting, how much bleach is added to water?

To create a 10% bleach solution, one needs to consider the total volume of the solution and the desired concentration of bleach in that volume. A 10% solution means that 10% of the total volume is bleach, and the remaining 90% should be water.

If the total volume is to be 1,000 mL (which makes calculations straightforward), then 10% of that volume would be 100 mL of bleach. This indicates that 900 mL of water is required to make up the rest of the solution, matching the concentration correctly.

Using this reasoning, adding 100 mL of bleach to 900 mL of water results in a total volume of 1,000 mL, with the bleach accounting for precisely 10% of that volume.