62 5. To what volume must each of the following be diluted to give the concentra
ID: 1037687 • Letter: 6
Question
62 5. To what volume must each of the following be diluted to give the concentration called for? a. 10.0ml of 6.00N HNOs to give 0.200N solution (300ml) b. 9.00ml of concentrated H,So. (18.0M) to give a 0.300M solution (540ml) 6 24.60ml of 0, 185N HNO, is trated with 27.35ml of KOH solution. What is the normality of the KOH? (0.166N) 7. The molar mass of phosphoric acid is 98.0 grams. What is its equivalent weight in each of the following reactions? a. H3POs AI(OH)-AIPOs+3H20 b. H3POs NaOH NaH2PO4 + H2O (32.7g) (98.0g) (49.0g) (32.7g) (98.0g) e. H3PO4+Ca(OH)2- Ca(H2PO4)2+2H20Explanation / Answer
5.a.
before dilution after dilution
N1 = 6N N2 = 0.2N
V1 = 10ml V2 =
N1V1 = N2V2
V2 = N1V1/N2
= 6*10/0.2 = 300ml
b. before dilution after dilution
M1 = 18M M2 = 0.3M
V1 = 9ml V2 =
M1V1 = M2V2
V2 = M1V1/M2
= 18*9/0.3 = 540ml
6. HNO3 + KOH -------------> KNO3 + H2O
HNO3 KOH
N1 = 0.185N N2 =
V1 = 24.6ml V2 = 27.35ml
N1V1 = N2V2
N2 = N1V1/V2
= 0.185*24.6/27.35 = 0.166N
7.Basicity of acid: no of hydrogen atoms are replace from one molecule of acid is called basicity of acid.
a. Equalent weight = molar mass/basicity of acid
= 98/3 = 32.7g
b. Equalent weight = molar mass/basicity of acid
= 98/1 = 98g
c.Equalent weight = molar mass/basicity of acid
= 98/2 = 49g
d.Equalent weight = molar mass/basicity of acid
= 98/3 = 32.7g
e.Equalent weight = molar mass/basicity of acid
= 98/1 = 98g
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