Question

1. what is thet typical measure that is used for BOD?

2. What is added to water cor your teeth and why is it good and bad ?

3. what does EPA mean?

4. what scale measures strentths of acid and bases? what is the the values of acid, base, and neutral ?

Answer 1

1)BOD Means amounts of oxygen required by the water in 5 days at 20 degrees temperature.it measures the amount of organic matter that present in the water. The values of BOD indicates the how good water are lower value of BOD indicates that water is suitable for drinking. BOD value 1-2 ppm represents very good water.

2)fluoride is added to water for our teeth.the right amount of fluoride is very good for our teeth it protects from cavities and protects enamel from loosing of minerals and helps to increase the minerals in enamel.it also helps to kill bacteria that present in our teeth. So the right of fluoride take is good for our teeth.

3)EPA

EPA means environmental protection agency which provide laws and standards for the protection of humans and environment. This organization aim to protect the environment from the pollution and destruction so they provide some pollution control limits and standards of the effulent of industries and for inffulents like drinking water.

4)PH scale measures the strength of acidic or basic nature

PH means negative logorthemic of hydrogen ions H+ or OH–

PH scale have values from 1 to 14

Acidic nature indicates value less than 7

Neutral value is equal to 7

Basic nature means values greater than 7