Consider three generic acids: HX , HY , and HZ . The number of H plus and X minus ions in solution is equal to the initial number of HX molecules added to the solution. One quarter of the HZ molecules form H plus and Z minus ions in solution. The other three quarters of the molecules remain as HZ in solution. One half of the HY molecules form H plus and Y minus ions in solution. The other half of the molecules remain as HY in solution. Arrange the acids according to strength. Strongest acid Weakest acid Answer Bank

The strongest acid is HX, while the weakest is HZ.

Explanation: When we add water to an acid, the acid dissolves and dissociates. The reaction is: ⇒ . If it completely dissociates, it is a strong acid. If not, is a weak acid.

For HX, the question says the number of H and X is equal to the initial number HX, which means that all the dissociated. Thus, HX is a strong acid.

For HY, a half of molecules form ions, in other words, not all is dissociated, so HY is a weak acid.

For HZ, only a quarter of molecules form ions, so not all is dissociated, thus another weak acid.

Comparing HZ and HY, HZ is the weakest acid, since less molecules dissociated in water.

Arraging the acids from strongest to weakest will be HX, HY and HZ.

a. the law of proportion states the combination of 2 atoms in a specific ratio to produce multiple compounds such as the given statement of question ‘1st compound contains 88.8 % cu ’ indicates 88.8 g of cu is present along with 11.2 g oxygen in 100 g of compound whereas the statement ‘2st compound contains 79.9 % cu ’ indicates 79.9 g of cu is present along with 20.1 g oxygen in 100 g of compound

1st compound contains 88.8 g cu

for cu

m = 63 g /mol

atomic % = 88.8 /63 = 1.42

for o

m = 16 g /mol

atomic % = 11.2 /16 = 0.7

b. the emperical formula of 1st compound is

cu1.4o0.7

cu2o