What is the pH of a 0.15 M NH4NO3 solution at 25 oC? The Ka for NH4 + is 5.6 x 10-10 NH4 + (aq) + H2O(l) ↔ NH3(aq) + H3O + (aq)
The pH of a 0.25 M weak acid is 2.036. What is the Ka of the acid? HA(aq) + H2O (l) ↔ H3O+(aq) + A-(aq) 3.5 X 10-4 9.2X 10-3 7.0 X10-5 5.3 X 10-2 6.3 X 10-7 Explanation: [ H3O+] = antilog (-pH) =10-pH =10-2.306=9.2 X10-3 M [ H3O+] = [A-]=9.2 X10-3 M [HA] = 0.25 M- 0.0092 M=0.241 M Ka = [9.2 X10-3 M] [9.2 X10-3 M]/0.241 =3.52X10-4 I don't get why 10^-2.036= 9.2x10^3
1. Calculate the approximate [OH-] and [NH4+] in a 0.40 M ammonia solution, NH3(aq). NH3(aq) + H2O(l) ↔ OH-(aq) + NH4+(aq). Kb = 1.75 x 10-5M. 2. Calculate the pH of 0.178 M ammonia. NH3(aq) + H2O(l) ↔ OH-(aq) + NH4+(aq) Kb = 1.75 x 10-5
This question pertains to the pH of a weak acid/weak base salt combo. For an aq solution of NH4NO2, these are the combinations of reactions that are possible. (1) NH4+(aq) + NO21-(aq) ⇆ NH3(aq) + HNO2(aq)____________K1 = ? (2) NH4+(aq) + H2O(l) ⇆ H3O+(aq) + NH3(aq)_______________Ka = 5.6 x 10-10 (3) NO21- + H2O(l) ⇆ HNO2(aq) + OH-(aq)_________________Kb = 2.2 x 10-11 (4) 2H2O(l) ⇆ H3O+(aq) + OH-(aq)_________________________Kw =1.0 x 10-14 Write the symbolic expression for the equilibrium constants...
Need help with these, please. 1).A solution contains 0.0387 M HNO3, 0.0222 M HI, and 0.280 M formic acid, HCOOH. What is the pH? 2). A solution contains 0.100 M Ba(OH)2 (strong base) and 0.230 M ammonia, NH3 (weak base). What is the pH? 3). Calculate the approximate [OH-] and [NH4+] in a 0.49 M ammonia solution, NH3(aq). NH3(aq) + H2O(l) ↔ OH-(aq) + NH4+(aq). Kb = 1.75 x 10-5M.
1. Calculate the concentration of H3O+ for an aqueous solution with a pH of 1.2 A) 6.3 x 10-7M B ) 1.6 x 108 M. C) 1.0 x 10-14 M. D) 6.20 x 10-2 M E) 4.0 x 10-4M 2. Calculate the concentration of OH- for an aqueous solution with a pH of 13.8. A) 0.64 M B) 4.0 x 10-5M C) 1.5 x 10-5M D) 1.0 x 10-14 M E) 2.5 x 10-10 M 3. Which of the following...
What is the pH of a 0.5 M solution of NH3? (Ka for NH4+ is 6.02 x 10-10)
A) How many milliliters of 0.15 M HCl would have to be added to 1.0 L of a buffer containing 0.25 M NH3 and 0.45 M NH4 to make the pH decrease by 0.05 pH unit? The Ka value = 5.6 x 10^-10. B) How many milliliters of the same HCl solution would, if added to 0.204 L of pure water, make the pH decrease by 0.05 pH unit?
What is the pH of a 0.44 M solution of a weak acid HA, with a Ka of 3.19×10−12? The equilibrium expression is: HA(aq)+H2O(l)⇌H3O+(aq)+A−(aq)
What is the [H+] of a solution containing 0.30 M NH3 and 0.15 M NH4NO3? Kb for NH3 = 1.8 times 10^-5
What is the pH of a 1.25 L carbonate buffer which was prepared by mixing 0.4098 M of Na2CO3 and 0.550 M NaHCO3. (Ka of HCO3- = 4.70 x 10-11) HCO3- (aq) + H2O (l) ↔ CO32- (aq) + H3O+ (aq)