A standard procedure for the emergency...

Question 1 / 205eccef9cbacbc34ba4d45726

Question 1 of 205eccef9cbacbc34ba4d45726

A standard procedure for the emergency disinfection of water in a potable water tank is to add a small amount of standard laundry liquid chlorine bleach to the water tank. Approximately how much bleach would be considered appropriate to add to a tank containing 1000 gallons of water?

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🔍 Key Concepts

• Centers for Disease Control and Prevention (CDC) guidance for emergency water disinfection with household bleach • Typical household bleach strength of 5%–6% sodium hypochlorite and the usual dosage of bleach per gallon of water • Scaling a known "drops per quart" or "teaspoons per gallon" dosage up to a 1000‑gallon tank

💭 Think About

• First, recall roughly how many drops or teaspoons of bleach per gallon are recommended for clear emergency drinking water, then multiply up to 1000 gallons and convert to pints/quarts/gallons. • Estimate how many gallons of household bleach would make the water obviously over‑chlorinated and unsafe to drink, and eliminate those choices. • Compare the usual bleach dose used for a small 1–5 gallon container to what each option (1 pint, 1 quart, 1 gallon, 2 gallons) would mean per gallon of water in a 1000‑gallon tank.

✅ Before You Answer

• Verify the assumed concentration of household laundry bleach (around 5%–6% sodium hypochlorite, not concentrated pool chlorine). • Convert each answer choice into ounces or teaspoons per gallon for a 1000‑gallon tank and see which is closest to common emergency disinfection guidelines. • Make sure the final amount would give a few parts per million (ppm) of chlorine, not tens or hundreds of ppm, which would clearly be excessive.

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Question 1 of 20

one pint

one quart

one gallon

two gallons

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Question 1 / 205eccef9cbacbc34ba4d45726

Question 1 of 205eccef9cbacbc34ba4d45726

Back

Question 1 of 20

5eccef9cbacbc34ba4d45726

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🔍 Key Concepts

💭 Think About

✅ Before You Answer

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