What is the correct ratio for preparing a 10% bleach solution?

To prepare a 10% bleach solution, it is essential to understand the appropriate dilution of household bleach in relation to water. Household bleach typically has a concentration of around 5.25% to 6.0% sodium hypochlorite. To achieve a solution that is approximately 10% bleach, a higher ratio of bleach to water is necessary.

Adding one and three-quarters cups of household bleach to one gallon of water creates the right balance. This mixture results in a higher concentration of bleach (close to the intended 10%) when calculated based on the overall volume of the solution, ensuring effective disinfection.

Other options do not yield the correct proportions for a 10% solution. For instance, two cups of bleach diluted in two gallons of water would significantly lower the concentration, making it much less than 10%. Similarly, using one cup or one-half cup of bleach in one gallon of water would not reach the desired concentration needed for effective cleaning and disinfection.

Thus, the first choice is the only one that accurately represents the correct dilution ratio for achieving a 10% bleach solution.