What is the pKa for the acid HA if a solution of 0.65 M HA and 0.85 M NaA has a pH of 4.75? Ka for hydrofluoric acid is 6.8 x 10-4. What is the first digit of the pKa value for hydrofluoric acid? Find the approximate pK_a value for Decanoic acid. Chloroacetic acid, ClCH_Chlo...
Write the equilibrium constant expression for each of the following reactions. a. NH4+ (aq) + OH- (aq) ---> NH3 (aq) + H2O (I) b. HOCI (aq) + NH3 (aq) ---> NH4+ (aq) + CIO- (aq) c. CaCO3 (s) ---> C In the reaction: [Co(H2O)6]2+(aq)...
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We use this law to determine the pH value of a buffer solution considering the acid dissociation constant and concentrations of acid and base. We define {eq}pK_a {/eq} using the acid dissociation constant {eq}K_a {/eq} considering the below expressio...
What is the conjugate base for the acid HI? For what acid is Cl- the conjugate base? What is the conjugate base for the acid CH3NH3+? For what acid is H2PO4- the conjugate base?Calculate the ionization constant for each of the following acids or...
Given that Ka for HF is 6.3 x 10-4 at 25^o �C, what is the value of Kb for F- at 25^o �C? Given that Kb for CH_3NH_2 is 5.0 � 10-4 at 25^o �C, what is the value of Ka for CH3NH3 at 25^o �C? The Ka for HF is 6.9...
The value of Ka for acetylsalicylic acid (aspirin) is 3.00×10−4. What is the value of Kb for its conjugate base, C9H7O4−? Dissociation Constant: The acid dissociation comes into the picture when a solution contains a weak acid, and it...
What is the pH after 0.32 moles of HCl is added to a 1.00 L buffer containing 1.00 moles of HOBr and 1.00 moles NaOBr? K_a (HOBr) = 2.5 times 10^{-9}. A buffer containing 0.100 moles of NH3 (Kb = 1.8 x 10-5) and 0.100...
Determine the Ka for formic acid if a 0.10 M solution has a pH of 2.38. Calculate the pH of a 0.10 M solution of CoCl3. The Ka value for Co(H2O)6^3+ is 1.0 x 10^-5. Calculate the pH of a 0.045 M HOBr solution. (Ka = 2.5 x 10-9) Calculate the...
Calculate the pH of the 0.20 M NH_3 0.20 M NH_4Cl buffer. What is the pH of the buffer after the addition of 10.0 mL of 0.10 m HCl to 65.0 mL of buffer? a. Calculate the pH of a 0.20 M NH3 and 0.15 M NH4Cl bu...