Which substance completely dissociates in water? A) weak acids B) strong acids I
ID: 1059069 • Letter: W
Question
Which substance completely dissociates in water? A) weak acids B) strong acids If the solubility of KCI in 100ml of H_2 O is 35 g at 20 degree C and 43 g at 50 degree C, label each of the following unsaturated(US), saturated(S) or supersaturated(SS). If solid is added than can undissolved solid regains at the flask. A) adding 30g to 100ml of H_2 O at 20 degree c B) adding 65g to 100ml of H_2 O at 50 degree C C) adding 20g to 50ml of H_2 O at 20 degree c D) adding 42g to 100 ml of H_2 O at 50 degree C and slowly cooling to 20 degree C to give a clear solution with no precipitate Write the equation for the acid-base reaction that takes place when nitric acid dissolves in water. Label the conjugate acid-base pairs also. Marble statues, which are composed of calcium carbonate, are slowly eaten away by the nitric acid in acid rain. Write a balanced equation for this reaction with products of a salt, carbon dioxide, and water.Explanation / Answer
30) A) At 20oC your solution can dissolve 34 gm of solute, therefore adding 30 gm to 100 mL of water
means your solution is undersaturated ( < 34 gm)
B) The solution will be supersaturated ( 65 gm > 45 gm)
C) Undersaturated , ( 20 gm < 34 gm)
D) If there is no precipitate left, then that means solution is saturated
31) HNO3 (acid) + H2O <---------------> H3O+ + NO3- (conjugate base)
Acid is a proton donor and base proton acceptor
So, HNO3 is the acid since it can give off its H+ and NO3- is its conjugate base
32) CaCO3 + H2SO4 CaSO4 + CO2 + H2O
Calcium carbonate, the major component of marble, easily reacts with sulfuric acid
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