Enviromental engineering Problem 52 5 pts Show that a 450 pe

Problem 5-2 [5 pts] Show that a 4.50 percent by weight mixture contains 45.0 kg of substance in a cubic meter of water (4.50% 45.0 kg/ms). Assume the density of waters 1,000 kg/m2 Problem 5-4 [5 pts] What is the concentration of chlorine (in mg/L) of household bleach that contains 5.25 percent by weight of C&? Assume the density of water = 1.000 kg/m) Problem 5-6 [5 pts] In 2001, the U.S. EPA promulgated a new standard MCL for arsenic in drinking water The standard is now 10 parts per billion (ppb). What is the concentration in mg/L? Problem 5-14 [5 pts] How many mg/L of magnesium ion w remain in solution in water that is 0.001000 M in hydroxyl ion at 25 C? ANS: 0.1367 mgL Problem 5-28 [5 pts] Convert the following from mg/L as the ion to mg/L as CaCO a) 83.00 mg/L Ca b) 27.00 mg/L Mg c) 48.00 mg/L CO2 Spring 2018 Problem 5-30 [5 pts)] Convert the following from mg/L as CaCOs to mg/L as the ion or compound: a) 100.00 mg/L so b) 30.00 mg/L HCO c) 150.00 mg/L C Problem FE 54 [5 pts) Estimate the approximate alkalinity, in mgL as CaCOs, of water with a carbonate ion concentration of 17.0 mg/L and a bicarbonate ion concentration pf 111.0 mg/L a. 119 mg/L as CaCO b. 128 mg/L as CaCOs c. 148 mg/L as CaCO d. 146 mg/L as CaCOs

Solution

Q.5.2

4.5% by weight means that each 100 kg of water will carry 4.5 kg of substance.

unit weight of water = 1000 kg/m3

so volume of 100 kg of water = 100/1000 = 0.1 m3

that means 0.1 m3 carries 4.5 kg of substance, then 1 m3 will carry = 4.5/0.1 = 45 kg per m3.

Q.5.4

5.25% of chlorine by weight means that each 100 gm of water carries 5.25 gm of chlorine.

unit weight of water = 1000 kg/m3 = 1kg/Litres = 1000 g/Litres

volume of 100 gm of water = 100/1000 litres = 0.1 Litres.

so one litre of water will carry 5.25 /0.1 gm of chlorine= 52.5 gm/Litres = 52500 mg/L

So chlorine concentration is 52500 mg/L in water.