A 1.00 liter solution contains 0.45 M nitrous acid and 0.59 M sodium nitrite. If 0.150 moles of calcium hydroxide are added to this system, indicate whether the following statements are true or false. (Assume that the volume does not change upon the addition of calcium hydroxide.)
TrueFalse A. The number of moles of HNO2 will decrease. TrueFalse B. The number of moles of NO2- will remain the same. TrueFalse C. The equilibrium concentration of H3O+ will increase. TrueFalse D. The pH will increase. TrueFalse E. The ratio of [HNO2] / [NO2-] will increase.

Astudent is given a sample of a blue copper sulfate hydrate. he weighs the sample in a dry covered porcelain crucible and got a mass of 23.875 g for the crucible, lid, and sample. the mass of the empty crucible and lid was found earlier to be 22.652 g. he then heats the crucible to expel the water of hydration, keeping the crucible at red heat for 10 minutes with the lid slightly ajar. on colling, he finds the mass of crucible, lid, and contents to be 23.403 g. the sample was changed in the process to very light clue anhydrous cuso4. if there are again 100.0 g of hydrate, how many grams of cuso4 are in it? how many moles of cuso4? (hint: molar mass of cuso4 = 159.6 g / mole. what per cent of the hydrate is cuso4? you may convert the mass of cuso4 to moles.)