October 22, 2009

General Chemistry (Part 4): Salts Hydrolysis

1) What is definition of:
a) Salts hydrolysis
b) Partial hydrolysis
c) Total hydrolysis

2) State the type hydrolysis and the properties of the following salts and then :
a) KCl
b) MgBr2
c) SrCl2
d) AlBr3
e) FeSO4
f) Ca(CH3COO)2
g) NaCN
h) (NH4)2S
i) (NH4)2SO4

3) Explain how MgCl2 will show acidic properties when it dissolved in water.

4) Which salt will take the total hydrolysis?
A. NaCl
B. NH4CN
C. NaCN
D. CH3COONa
E. CH3COONH4

5) Which salt will have pH above 7 if dissolved in water?
A. CH3COONa
B. CH3COONH4
C. NH4CN
D. (NH4)2SO4
E. FeSO4

6) Which salt will have acidic properties?
A. NaCl
B. NH4Cl
C. CaCl2
D. BaSO4
E. Na2SO4

7) Which salt will be acidic?
A. Potassium acetate
B. Sodium acetate
C. Sodium chloride
D. Ammonium acetate
E. Ammonium chloride

8) Which salt will not be hydrolyzed?
A. KF
B. NaCN
C. NH4Cl
D. MgSO4
E. CH3COONH4

9) Which solution will produce the partial salt hydrolysis and basic if the number of mole of the reagents is equivalent?
A. HCl and NaOH
B. NH3 and CH3COOH
C. H2SO4 and NH3
D. NaOH and CH3COOH
E. HCl and NH3

10) If the reagent of the following solutions is 1 M, which solution will have the highest pH?
A. HCl dan NaOH
B. HCl dan NH3
C. CH3COOH dan NH3
D. CH3COOH dan NaOH
E. H2SO4 dan NH3

11) Which couple solution will produce the hydrolyzed salt?
A. 100 ml NH3 (aq) 0,1 M + 100 ml H2SO4 0,1 M
B. 50 ml HCN 0,1 M + 50 ml KOH 0,05 M
C. 200 ml CH3COOH 0,05 M + 200 ml Ca(OH)2 0,05 M
D. 10 ml HCl 0,1 M + 20 ml NH3 (aq) 0,05 M
E. 50 ml KOH 0,2 M + 50 ml HCN 0,1 M

12) Which salt formula will be hydrolyzed as below?
CN– (aq) + H2O (l) HCN (aq) + OH– (aq)
A. NH4CN
B. CH3CN
C. Mg(CN)2
D. NaCN
E. Fe(CN)3

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11 Comments:

Blogger marry said...

oho good dear !!!! very interesting blog and a good posting !!! you must maintain your blog, its interesting !!! Nice Buddy
________________________________

Research APA Paper Format

December 03, 2009  
Blogger wyd said...

thx marry
seems no much time recently but i'll try my best

December 04, 2009  
Blogger MAY'S said...

wah... aku udah lupa semuanya....

December 10, 2009  
Anonymous Anonymous said...

Name : Fitria Kusuma Dewi
Rinda Ariasta Z
Class : XII PSIA 1

1)a. Salt hydrolysis is the decomposition of salt by water to produce back the acid and the base.
b. Partial hydrolysis is the hydrolysis where the salt comes from weak acid and strong base or vice versa, and only one ion that experiences hydrolysis reaction, and the other is not.
c. Total hydrolysis happens if the salt comes from weak acid and weak base.

August 30, 2010  
Anonymous Anonymous said...

Name : Astri Yuanita Herry Putri
Chynta Rahma Vanvie

7) Which salt will be acidic?
A. Potassium acetate
B. Sodium acetate
C. Sodium chloride
D. Ammonium acetate
E. Ammonium chloride

the answer is E. NH4Cl (amonium chloride)
NH4Cl is formed NH4OH (weak base) and HCl (Strong acid)
because of that the combining of weak base and strong acid, will become acidic salt.

August 30, 2010  
Anonymous Anonymous said...

Name : Astri Yuanita Herry Putri
Chynta Rahma Vanvie

7) Which salt will be acidic?
A. Potassium acetate
B. Sodium acetate
C. Sodium chloride
D. Ammonium acetate
E. Ammonium chloride

the answer is E. NH4Cl (amonium chloride)
Salt which formed by the raction of strong acid and weak base,only cation that will hydrolyzis (partial hydrolysis). in this case, the PH of this salt will less than seven.

NH4Cl is formed NH4OH (weak base) and HCl (Strong acid)
because of that the combining of weak base and strong acid, will become acidic salt.

August 30, 2010  
Anonymous Anonymous said...

Name : Berly ramanda saputra
M Hari Rezki

3) Mgcl2 + 2H20 -> Mg(OH)2 + 2HCL
HCl is strong acid, while Mg(OH)2 is a weak base. So, MgCl2 will show acidic properties when it dissolved in water .

August 30, 2010  
Blogger rike said...

This comment has been removed by the author.

August 30, 2010  
Blogger rike said...

Nama : Rike Lestari
Indah Tridiyanti

Kelas: XII PSIA 1

8)E. MgSO4
In water, MgSO4 form ions Mg 2+ and SO4 2-

MgSO4 (aq) => Mg 2+(aq) + SO4 2-(aq)

Mg 2+ ions derived from strong acids and SO4 2- ions derived from a strong base so they do not react with water.

Mg 2+ (aq) + H2O (l) => (no reaction)

SO4 2-(aq) + H2O (l) => (no reaction)

Therefore, the solution remains neutral
(pH = 7).

August 30, 2010  
Anonymous Anonymous said...

Nama: M Raedi Ardian
Satria Marrantiza

Kelas: XII PSIA 1

4) Which salt will take the total hydrolysis?
A. NaCl
B. NH4CN
C. NaCN
D. CH3COONa
E. CH3COONH4

answer:

Total hydrolysis is a hydrolysis where the comes from strong acid and strong base.

NaOH(aq)+ HCl(aq)=> NaCl(aq)+ H2O(l)

NaOH is strong base and HCl is strong acid, so NaCl comes from total hydrolysis.

a. NaCl

August 31, 2010  
Anonymous Anonymous said...

XII PSIA 1
Evan ferdian basri
Mustafa Haidar

6. B)NH4CL

Because NH4CL comes from weak base (NH4OH)and (HCL)strong acid.
When teh reaction happens between strong acid and weak base ,the salt will have acidic properties

August 31, 2010  

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