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Pianist
Subject: Chemistry
, asked on 24/12/17
Please solve this asap
Q43. Ammonium hydrogen sulphide is contained in a closed vessel at 313 K when total pressure at equilibrium is found to be 0.8 atm. The value of K
p
for the reaction, NH
4
HS(s)
⇌
NH
3
(g) + H
2
S(g) is:
(a) 0.16 (b) 1.6
(c) 0.016 (d) 16
Answer
3
Amitesh Kumar
Subject: Chemistry
, asked on 19/12/17
26. The pH of an aqueous acetic acid solution with a density 1.09 g/mL is 2.45. What is the mass percent of acetic acid in solution?
27. How much (volume) of 0.001 (M) HCl (aq) should we add to 10 mL of 0.001 (M) NaOH to change its pH by one unit?
29. Find out the volume of 0.1 (M) acetic acid that is added to 1.00 litre of water until the pH of the resulting solution is 4.00.
K
a
f
o
r
a
c
e
t
i
c
a
c
i
d
=
1
.
8
x
10
-
5
Answer
1
Priyanshi
Subject: Chemistry
, asked on 18/12/17
Please give solution with detailed explanation
*
I
f
20
m
l
0
.
15
M
H
C
l
s
o
l
u
t
i
o
n
i
s
a
d
d
e
d
t
o
a
10
m
l
0
.
1
M
10
H
2
S
O
4
s
o
l
u
t
i
o
n
,
w
h
a
t
w
i
l
l
b
e
t
h
e
p
H
o
f
t
h
e
r
e
s
u
l
t
i
n
g
m
i
x
t
u
r
e
?
(
T
e
x
t
u
a
l
E
x
.
4
(
13
)
)
Answer
1
Dharani
Subject: Chemistry
, asked on 16/12/17
pka for an acid HA is 4.7 what is pkb for its conjugate base
Answer
1
Hermoine
Subject: Chemistry
, asked on 16/12/17
how is ph dependent on ionization enthalpy??
Answer
1
Capt. Jack Sparrow
Subject: Chemistry
, asked on 8/12/17
in some questions there are some compunds given and we are asked to tell which act both as bronsted acid and base ... how can we determine it .. is there any way... no links -. dont block the chat if not understood
Answer
1
Palak Srivastava
Subject: Chemistry
, asked on 7/12/17
I am not able to understand the meaning of the symbol B [(B)e]
Q1. The equilibrium concentration of B [(B)
e
] for the reversible reaction A
⇌
B can be evaluated by the express
(A) K
C
A
e
-
1
(B)
k
f
k
b
A
e
-
1
(C)
k
f
k
b
-
1
A
e
(D)
k
f
k
b
-
A
-
1
Answer
1
Arshia Sharma
Subject: Chemistry
, asked on 6/12/17
4) 20 mL o f 0.2 M sodium hydroxide is added to 50 mL of 0.2 M acetic acid to give 70 mL of the solution. What is the pH of the solution? Calculate the additional volume of 0.2 M NaOH required to make the pH of solution 4.74. The ionisation constant of acetic acid is
1
.
8
×
10
-
5
.
Answer
1
Raj Aryan
Subject: Chemistry
, asked on 30/11/17
Q no 2 please!
Answer
1
Raj Aryan
Subject: Chemistry
, asked on 30/11/17
Solve this:
The solubility product of SrF
2
in water is 8 x 10
-10
.calculate the solubility in 0.1 (M) NaF solution.
(1) 8 x 10
-4
(2) 9 x 10
-4
(3) 11 x 10
-4
(4) 13 x 10
-4
Answer
1
Raj Aryan
Subject: Chemistry
, asked on 30/11/17
The solubility of Pbso4 in H20 is 0.038g/L at 25 degree celcius. Calculate Ksp of PbSO4 at sane temperature.
Answer
1
Raj Aryan
Subject: Chemistry
, asked on 30/11/17
Question no.4 please!
Answer
1
Raj Aryan
Subject: Chemistry
, asked on 30/11/17
Which of the following solutions containing weak acid and salt of its conjugate base has maximum buffer capacity?
A. [Salt]=[Acid]
B. [salt]> [acid]
C. [Salt]D. [Salt]+[Acid] is minimum
Answer
1
Vanshika Sharma
Subject: Chemistry
, asked on 29/11/17
Formula for number of atoms of nuclides left after disintegration?
Answer
1
Arshia Sharma
Subject: Chemistry
, asked on 27/11/17
Solve this:
Q.
Example 7
. A solution contains 0.1 MH
2
S and 0.3 MHCl. Calculate the concentration of S
2–
and HS
–
ions in solution. Given K
a1
and K
a2
for H
2
S are 10
–7
and 1.3 × 10
–13
respectively.
Answer
1
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Q43. Ammonium hydrogen sulphide is contained in a closed vessel at 313 K when total pressure at equilibrium is found to be 0.8 atm. The value of Kp for the reaction, NH4HS(s) NH3(g) + H2S(g) is:
(a) 0.16 (b) 1.6
(c) 0.016 (d) 16
27. How much (volume) of 0.001 (M) HCl (aq) should we add to 10 mL of 0.001 (M) NaOH to change its pH by one unit?
29. Find out the volume of 0.1 (M) acetic acid that is added to 1.00 litre of water until the pH of the resulting solution is 4.00.
Q1. The equilibrium concentration of B [(B)e] for the reversible reaction A B can be evaluated by the express
(A) KC (B) (C) (D)
The solubility product of SrF2 in water is 8 x 10-10.calculate the solubility in 0.1 (M) NaF solution.
(1) 8 x 10-4
(2) 9 x 10-4
(3) 11 x 10-4
(4) 13 x 10-4
A. [Salt]=[Acid]
B. [salt]> [acid]
C. [Salt]D. [Salt]+[Acid] is minimum
Q. Example 7. A solution contains 0.1 MH2S and 0.3 MHCl. Calculate the concentration of S2– and HS– ions in solution. Given Ka1 and Ka2 for H2S are 10–7 and 1.3 × 10–13 respectively.