What is the molarity of the acid?
a. 0.40 M
b. 2.0 M
c. 10. M
d. 4.0 M
2007-09-01 09:42:28 · 2 answers · asked by REZmerized 1 in Science & Mathematics ➔ Chemistry
2.0molar is also moles/Liter therefore
2.0 moles/L NaOH x 0.040L= 0.08 moles NaOH
If it is a monoprotic acid then you also have 0.08 moles of the acid. If it takes 8.0 mL's to react then you have
0.08moles H+/0.008L= 10 Molar
The answer is C
2007-09-01 12:22:32 · answer #1 · answered by scott k 4 · 0⤊ 0⤋
NaOH + HA = NaA + H2O
NB all the reactants & products are in the ratio of 1:1::1:!
because the acid is mono - 1 - monoprotic.
mol(NaOH) = (2.0 x 40)/1000
mol(NaOH) = 0.08
Since all the reagents are in the ratio of 1:1
mol(NaOH) = Mol(HA) = 0.08
0.08 = ([concHA] x 8.0)/1000
& algebraically rearranging:-
[concHA] = (0.08 x 1000)/8.0
[concHA] = 10 mol L^-1 = 10.M (the molarity)
2007-09-01 09:59:08 · answer #2 · answered by lenpol7 7 · 0⤊ 1⤋