Calculate the missing numbers and enter them in the blanks. One of the full-stre

Question

Calculate the missing numbers and enter them in the blanks.

One of the full-strength disinfectants was a 5.25% solution of sodium hypochlorite (NaClO), also known as bleach. Concentrations below 1% are often expressed as parts per million (ppm). One ppm is 1% of 1% of 1%. So, another way to write 5.25% NaClO, which means 5.25 grams of NaClO per 100 ml of water, is 52500 ppm NaClO. Five ml of a 52500 ppm NaClO solution in tube 1 were added to 5 ml of water in tube 2, so the concentration in tube 2 was____ ppm NaClO. Two ml from tube 2 were added to 8 ml of water in tube 3, so the concentration in tube 3 was _____ppm NaClO. Two ml from tube 3 were added to 8 ml of water in tube 4, so the concentration in tube 4 was _____ ppm NaClO. Two ml from tube 4 were added to 8 ml of water in tube 5, so the concentration in tube 5 was ______ ppm NaClO.

Explanation / Answer

Five ml of a 52500 ppm NaClO solution in tube 1 were added to 5 ml of water in tube 2, so the concentration in tube 2 was 26250 ppm NaClO.

Two ml from tube 2 were added to 8 ml of water in tube 3, so the concentration in tube 3 was 5250 ppm NaClO. Two ml from tube 3 were added to 8 ml of water in tube 4, so the concentration in tube 4 was 1050 ppm NaClO. Two ml from tube 4 were added to 8 ml of water in tube 5, so the concentration in tube 5 was 210 ppm NaClO.

We made half the concentration in the tube 1 and then 1/5 th in all the rest of the tubes.

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