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1. Express 95 mg/l of Ca2+ as milligrams per liter of CaCO3.
2. Express 221 mg/l of Ca(HCO3)2 as equivalents per liter of CaCO3.
3. Determine the concentration of the following ions at equilibrium with the solid at 25 degrees C.
a. Cr3+ + 3OH- >>>Cr(OH)3, Ksp = 6 x 10-31
b. CA2+ + 2 OH- >>>Ca(OH)2, Ksp = 8 x 10 -6
4. A 100-ml sample of water is titrated with 0.02 N H2SO4. The initial pH is 9.5 and 6.2 ml of acid is required to reach the pH 8.3 endpoint. An additional 9.8 ml of the acid is required to bring the sample to the pH 4.5 endpoint. Identify the species of alkalinity present and determine the concentration (mg/l) of each expressed as mg/L as CaCO3.
The de-Broglie wavelength associated with a particle of mass 10 -6 kg moving with a velocity of 10 ms -1 , is: (1) 6.63 x 10 -22 m (2) 6.63 x 10 -29 m
its principle
Equivalent Weight
Relationship between nucleon number,proton number and the number of neutrons.
Physical Properties of Acetic Acid (a) It is a colourless, at ordinary temperature, corrosive liquid along with a sharp pungent odour of vinegar. It has a sour taste. (b) Be
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