20 mL of standard hard water having 2200 mg/L of CaCO3 when titrated against EDTA solution which gave an end point at 19 mL. The same EDTA was used to titrate 29 mL sample hard water
which gave an end point at 25 mL. 100 mL of the same hard water sample was boiled, cooled
and filtered and made up with distilled water to 100 mL. 23 mL of this water sample consumed
15 mL of the same EDTA. Calculate the temporary, permanent and total hardness of the water
sample.

Explanation:

cube of any positive integer is of the form 9m,9m+1 or 9m+8. In this question, why do we take a=3q, a=3q+1 and a=3q+2. why cant we take a=2q and a=2q+1. or a=5q, 5q+1, 5q+2, 5q+3 and 5q+4. why do we specifically use a=3q and 3q+1 if a is any positive integer and can be represented in other ways?

the correct name for the n3 ion is azide. azide is a polyatomic anion with a -1 charge and is written as n3 -1. it consists of three nitrogen atoms bonded together. hope i . let me know if you need anything else.

chemical digestion occurs in the stomach were hcl and pepsin forms chyme, the mouth in which salivary amylase breaks down starch to form bolus, and the small intestine specifically the duodenum.