Question 1 Silver arsenate (Ag3AsO4) is a slightly soluble salt with Ksp = 1.0x10-22 M4 at 25...

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Question 1  Silver arsenate (Ag3AsO4) is a slightly soluble salt with Ksp = 1.0x10-22 M4 at 25 °C.Ag3AsO4(s) ? 3Ag+(aq) + AsO43-(aq) i. Calculate the molar solubility of silver arsenate in pure water at 25 °C. ii. Calculate the molar solubility of silver arsenate in 0.10 M AgNO3. Question 2  Milk of magnesia is an ‘over the counter’ pharmaceutical preparation used as a laxative and for heartburn. It can be prepared by saturating water with magnesia (MgO). At 25 °C, a magnesia suspension has a pH of XXXXXXXXXXWrite a balanced equation for the equilibrium between the MgO(s) and the ions it produces in solution. Calculate the equilibrium constant for this reaction at 25 °C. What is the solubility of MgO in water?Question 3 Estimate the pH of 0.001 M solutions of the following: i.  HNO3 ii.  KOH iii.  Na2CO3 iv.  NaCl v.  Phenol
	
Document Preview: CHE1C1A: CHEMISTRY 1A,This assignment should be submitted with a statement of authorship, with your name written clearly on the top right hand corner. Include all calculations and references you use. Question 1 	      Silver arsenate (Ag3AsO4) is a slightly soluble salt with Ksp = 1.0x10-22 M4 at 25 °C.Ag3AsO4(s) ? 3Ag+(aq) + AsO43-(aq)	i. Calculate the molar solubility of silver arsenate in pure water at 25 °C. 		ii. Calculate the molar solubility of silver arsenate in 0.10 M AgNO3. 	Question 2 	Milk of magnesia is an ‘over the counter’ pharmaceutical preparation used as a laxative and for heartburn. It can be prepared by saturating water with magnesia (MgO). At 25 °C, a magnesia suspension has a pH of XXXXXXXXXXWrite a balanced equation for the equilibrium between the MgO(s) and the ions it produces in solution. Calculate the equilibrium constant for this reaction at 25 °C. What is the solubility of MgO in water?Question 3	Estimate the pH of 0.001 M solutions of the following:	i. 	HNO3	ii. 	KOH							iii. 	Na2CO3	iv. 	NaCl	v. 	Phenol

David · Accepted Answer

La Trobe University, Bendigo
CHE1C1A: CHEMISTRY 1A,
This assignment should be submitted with a statement of authorship, with your name written clearly on the top right hand corner. Include all calculations and references you use. 
Question 1 
      Silver arsenate (Ag3AsO4) is a slightly soluble salt with Ksp = 1.0x10-22 M4 at 25 °C.
Ag3AsO4(s) ↔ 3Ag+(aq) + AsO43-(aq)
i. Calculate the molar solubility of silver arsenate in pure water at 25 °C. 
ii. Calculate the molar solubility of silver arsenate in 0.10 M AgNO3. 
Ans. (i) Let the molar solubility of Ag+ = AsO43- = s
Thus, 
Ksp = [Ag+]^3 [AsO43-] = (3s)^3 * s = 27s^4
Or, 1.0x10-22 = 27s^4
Thus, s= 1.39*10^-6 M
(ii) Concentration of Ag+ ions in pure water = 3s = 3*1.39*10^-6 = 4.17*10^-6M
But in presence of AgNO3, concentration of Ag+ from AgNO3 is 0.1M which is much greater than that obtained from water. Thus, [Ag+] = 0.1M
Therefore, Ksp = (0.1)^3 * s
Or, s = Ksp / (0.1)^3 = (1.0x10-22 )/ 0.

Question 1 Silver arsenate (Ag 3 AsO 4 ) is a slightly soluble salt with K sp = 1.0x10 -22 M 4 at 25 °C. Ag 3 AsO 4 (s) ? 3Ag + (aq) + AsO 4 3- (aq) i. Calculate the molar solubility of silver...

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