It is important because it helps with accuracy and precision of numbers. Also say you have an equation, you want to have an equal amount of significant figures to be accurate.
23. The correct answer would be a (AlPO4 + H2O).
This is an example of a neutralization reaction (an acid and a base react to form water and a salt).
24. a, combination reaction. There are two reactants and one product.
When
NaC2H3O2 is in solution, it would act as a base since it ionizes into sodium
ions and acetate ions, the acetate ions would interact with water with the
following reaction:<span>
C2H3O2- + H2O <---> C2H3O2H + OH-
So, from the reaction, hydroxide ions are formed
giving it basic properties. We calculate as follows:
[NaC2H3O2] = [Na+] = [C2H3O2-] = 0.250 m
By the ICE table:
[C2H3O2-] C2H3O2H OH-
I
0.250
0 0
C
-x
+x +x
------------------------------------------------------------
E 0.250
- x x
x
1.80×10^−5 = x^2 / (0.250 - x)</span>
Solving for x, we have
x = 0.002112
pOH = -log 0.002112
pOH = 2.68
pH = 14 - 2.68 = 11.32
Therefore, the pH of the solution is about 11.32.
Answer: Elements in the same family generally have similar properties because they contain the same number of the electrons, for instance.
Hope this helped!
