Sabai Nan Aluih: 2012

Mahasiswa tahun akhir itu.....tampang sok sibuk nenteng2 skripsi....sok keren (padahal di hati harap2 cemas judul ditolak dosen pembimbing). Tiap malam begadang bikin skripsi....(sambil nonton, sambil ngenet, sambil baca komik ...apa ini tidak teladan sekali). Mahasisiwa tingkat akhir itu suka ngejar-ngejar dosen dan dikejar-kejar deadline. Kadang kadang tampangnya sedih, cemas, takut, deg-degan (?) tapi tak jarang pula bertampang bahagia ketika kerja keras membuahkan hasil yang diharapkan...rasanya letih dan lelah jadi tak berarti. Mahasiswa tingkat akhir itu kadang agak tempramen...suka marah2 g karuan (entah karena apa itu apa lagi kalau disinggung2 kapan seminar? kapan kompre? kapan wisuda...) Tapi dibalik semua itu mahasiswa tingkat akhir punya tekad yang kuat untuk menyelesaikan skripsinya, dengan segenap kemampuan...kerja keras, mugkin hanya untuk satu kata ....kebahagiaan sederhana....(Kitalah mahasiswa tingkat akhir itu...mari berbahagia)

Kelarutan dan Hasil Kali Kelarutan

Bubuhkanlah tanda silang (X) pada jawaban yang kamu anggap paling tepat dari

soal-soal di bawah ini !

Nama :

Kelas :

1.The expression for the solubility product constant of Hg₂SO₄ is…….

a. Ksp = [Hg²⁺] [SO₄^2-]²

b. Ksp = [Hg⁺]² [SO₄^2-]²

c. Ksp = [Hg⁺]² [SO₄^2-]

d. Ksp = [Hg²⁺]² [SO₄^2-]

e. Ksp = [2Hg⁺] [SO₄^2-]

2. The equilibrium reaction for hardly dissolve salt Ag₃PO₄ in water is….

a. Ag₃PO_4(s) 3Ag⁺_(aq) +PO₄^3- _(aq)

b. Ag₃PO_4(s) Ag⁺_(aq) +PO₄³_-
(aq)

c. Ag₃PO_4(s) 3Ag⁺_(aq) +3PO₄^- _(aq)

d. Ag₃PO_4(s) 3Ag⁺_(aq) +PO₄^- _(aq)

e. Ag₃PO_4(s) Ag⁺_(aq)+3PO₄^3- _(aq)

3. In the following substances , that has higher solubility in mol/L is…

a. BaCrO₄ (Ksp = 1,2 x 10^-10)

b. BaSO₄(Ksp = 1,1 x 10^-10)

c. AgCl (Ksp = 1,8 x 10^-10)

d. Ag₂CrO₄ (Ksp= 1,1 x 10^-12)

e. CaF₂ (Ksp = 3,4 x 10 ^-11)

4. In 100 ml water can dissolve 1,16 mg Mg(OH)₂ (Mr= 58). Ksp of Mg(OH)₂ is....

a. 16,0 x 10^-12 d. 4,0 x 10^-10

b. 3,2 x 10^-11 e. 8,0 x 10^-8

c. 8,0 x 10^-11

5. Known Ksp of BaSO₄ is 1,1 x 10^-10 . The solubility of BaSO₄ is…..

a. 1,02 x 10^-2 mol/L

b. 1,03 x 10^-3 mol/L

c. 4,8 x 10 ^-4 mol/L

d. 1,05 x 10^-5 mol/L

e. 3,32 x 10 ^-5 mol/L

6. If Ksp of Mg(OH)₂ is 4 x10^-12 , the solubility of Mg(OH)₂ in 500 ml solution is………(Mr Mg(OH)₂= 58)

a. 58 x 10^-9 gram

b. 116 x 10^-9 gram

c. 29 x 10^-4 gram

d. 58 x 10^-4 gram

e. 116 x 10^-4 gram

7. M(OH)₃solution has pH = 9 . The Ksp value of this substance is ……

a. 3,3 x 10^-21 d. 3,0 x 10^-36

b. 3,0 x 10^-20 e. 1,35 x 10^-37

c. 1,1 x 10 ^-10

8 .If Ksp of BaSO₄ = 1,1 x 10^-10 , the solubility of BaSO₄ in Na₂SO₄ solution 0,02 M is ..….

a. 5 x 10^-8 mol/L

b. 5,5 x10^-8 mol/L

c. 5x 10^-9mol/L

d. 5,5 x 10^-9mol/L

e. 5,5 x 10^-7 mol/L

9. Ksp of AgCl is 1,6 x 10^-10 . The smallest solubility of AgCl is in…..

a. NaCl 0,1 M

b. HCl 0,01 M

c. AgNO₃ 0,03 M

d. NH₄Cl 0,02 M

e. pure water

10. The solubility of PbI₂ (Ksp=1,6 x 10^-8) in Pb(NO₃)₂ solution 0,1 M is….

a. 2 x 10^-3 M d. 4 x 10^-4 M

b. 4 x 10^-3 M e. 8 x 10^-4 M

c. 2 x 10^-4 M

11. If 100 ml NaCl 0,02 M is mixed with 200 ml Pb(NO₃)₂ 0,03 M (Ksp PbCl₂ = 1x 10⁸) it will happen…..

a. there is no precipitation

b. there is precipitate of NaCl

c. saturated solution

d.there is precipitate of PbCl₂

e. there is precipitate of NaNO₃

12. Known Ksp of Mg(OH)₂ = 4 x 10^-12 . If pH of MgCl₂ solution 0,04 M is increased, it will be formed precipitation in pH…..

a. 8 d. 11

b. 9 e. 12

c.10

13. In to CaCl₂ solution 0,03 M, NaOH solution is added until precipitation is formed. If pH is 12 . Ksp of Ca(OH)₂ is…

a. 3 x 10^-3 d. 9x10^-5

b. 3 x 10^-4 e. 3x10^-6

c. 9x10^-3

14.The solubility product constant (Ksp) of Mg(OH)₂ = 2 x 10^-11. If pH of MgCl₂0,2 M solution is increased with adding NaOH solid, precipitation will be formed in pH…

a. 8 d. 11

b. 9 e. 12

c. 10

15.If Ksp of Be(OH)₂ is 4 x 10^-18 ,the solubility of Be(OH)² in 1 liter solution is..

a. 4 x 10^-9 d. 1x 10^-6

b. 4 x10^-6 e. 2 x10^-9

c. 4 x 10^-5

16. The value of Ksp and Q can be used to predict the formation of precipitation. Precipitation will be formed if …

a. Ksp is too big d. Q > Ksp

b. Ksp > Q e. Q = Ksp

c. Q < Ksp

17. The following salt of silver that is easiest to dissolve is…

a. AgCl (Ksp = 1 x 10^-10)

b. AgBr (Ksp = 5 x 10^-13)

c. Ag₂SO₄ (Ksp = 5 x 10^-13)

d. AgI (Ksp = 1 x 10^-16)

e. Ag₂CrO₄(Ksp = 4 x 10^-18)

18. The solubility of AgCl (Ksp = 1 x 10^-10) in KCl 0,01 M solution is…

a. 1 x10^-2d. 1 x10^-6

b. 1 x10^-3 e. 1x 10^-8

c. 1 x10^-4

19. A saturated solution of X(OH)₂ has pH value 9 . The Ksp of X(OH)₂ is…

a. 1 x10^-10d. 5 x10^-16

b. 5 x10^-11e. 1 x10^-17

c. 1 x10^-15

20. In a solution there are Ca²⁺, Sr²⁺, Ba²⁺ and Pb²⁺ ions with same concentration. If the solution is dropped by Na₂SO₄ , the first compound that will be precipitated is…

a. CaSO₄ (Ksp = 2,4 x 10^-6)

b. PbSO₄ (Ksp = 1,7 x 10^-8)

c. SrSO₄ (Ksp = 2,5 x 10^-7)

d. it precipitates together

e. BaSO₄ (Ksp = 1,1 x 10^-10)