A35 mgd surface water treatement plant proposes to to use alum coagulation for turbidity reduction using 44 mg/ l alum. the raw water has an alkalinity of 80 mg / l as caco3. commercial alum has the formula al2(so4)3 x 18h2o (mw= 666).

a) determine the daily alum dosage required in kg/ day?

b) using the equivalent concept , how much alkalinity is used up by the alum added?

c) is the water alkalinity adequate. i. e , is it grater than the alkalinity consumed by alum?

How many molecules are found in 1.32 mol of nacl?

Name the intersection of plane bpq and plane cpq.

For a research project, a student decided to test the effect of the lead(ii) ion (pb2+) on the ability of salmon eggs to hatch. this ion was obtainable from the water‐soluble salt, lead(ii) nitrate, which the student decided to make by the following reaction. pbo(s) + 2 hno3(aq) → pb(no3)2(aq) + h2o losses of product for various reasons were expected, and a yield of 86.0% was expected. in order to have 5.00 g of product at this yield, how many grams of pbo should be reacted? (assume that sufficient nitric acid, hno3, would be used.)