Question

a.) Phosphoric acid is a triprotic acid: H3PO4(aq) +H2O(l) ↔ H3O+(aq) + H2PO4-(aq) Ka1 = 7.5...

a.) Phosphoric acid is a triprotic acid: H3PO4(aq) +H2O(l) ↔ H3O+(aq) + H2PO4-(aq) Ka1 = 7.5 x 10-3 H2PO4-(aq) +H2O(l) ↔ H3O+(aq) + HPO42-(aq) Ka2 = 6.2 x 10-8 HPO42-(aq) +H2O(l) ↔ H3O+(aq) + PO43-(aq) Ka3 = 4.8 x 10-13 Determine whether sodium monohydrogen phosphate (Na2HPO4) is neutral, basic, or acidic. First, what is its Ka when it acts as an acid?

b.) Second, what is its Kb when it acts as a base?

c.) Finally, indicate whether the HPO42- ion is neutral, basic, or acidic in solution.

Science   Chemistry   
0 0
Add a commentTranscribed image text
Next >

Homework Answers

Answer #1

a)For the the ion that dissociates is the one to analizes

HPO42- has a Ka of 6.2x10-8, its pKa=-logKa=7.20

That pKa indicates that the ion is a neutral ion (from the pH scale near 7 is neutral),when it act as an acid its Ka is the one indicated

b) when it act as a base

c) has a more basic behavior because it pKa=-log(4.8x10-3)=12.32, it is in the basic range in the pH scale

0 0
Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Log In

Sign Up

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
Which is the most prevalent species in a 0.25M aq solution of phosphoric acid, H3PO4? Ka1...
Which is the most prevalent species in a 0.25M aq solution of phosphoric acid, H3PO4? Ka1 = 7.5x10-3  , Ka2 = 6.2x10-8 , Ka3 = 4.2x10-13 a) H3PO4 b) H2PO4- c) HPO42- d) H3O+ The answer is A, can you explain why?
Phosphoric acid, H3PO4(aq), is a triprotic acid, meaning that one molecule of the acid has three...
Phosphoric acid, H3PO4(aq), is a triprotic acid, meaning that one molecule of the acid has three acidic protons. Estimate the pH, and the concentrations of all species in a 0.400 M phosphoric acid solution. pKa1 pKa2 pKa3 2.16 7.21 12.32 H3PO4=______M H2PO4-=______M HPO42-=________M PO43-=________M H+=_______M OH-=_______M pH=
phosphoric acid, H3PO4(aq), is a triprotic acid, meaning that one molecule of acid has 3 acidic...
phosphoric acid, H3PO4(aq), is a triprotic acid, meaning that one molecule of acid has 3 acidic protons. estimate the pH and concentration of all species in a .200 M phosphoric acid solution Ka1=6.9x10^-3, Ka2=602x10^-8, Ka3=4.8x10^-13
Phosphoric acid is a triprotic acid (Ka1 = 6.9× 10–3, Ka2 = 6.2× 10–8, and Ka3...
Phosphoric acid is a triprotic acid (Ka1 = 6.9× 10–3, Ka2 = 6.2× 10–8, and Ka3 = 4.8× 10–13). To find the pH of a buffer composed of H2PO4–(aq) and HPO42–(aq), which pKa value would you use in the Henderson-Hasselbalch equation? A) pKa1= 2.16 B) pKa2=7.21 C) pKa3= 12.32 Calculate the pH of a buffer solution obtained by dissolving 24.0 g of KH2PO4(s) and 43.0 g of Na2HPO4(s) in water and then diluting to 1.00 L.
Calculate the pH of 0.103 M phosphoric acid (H3PO4, a triprotic acid). Ka1 = 7.5 x...
Calculate the pH of 0.103 M phosphoric acid (H3PO4, a triprotic acid). Ka1 = 7.5 x 10-3, Ka2 = 6.2 x 10-8, and Ka3 = 4.8 x 10-13. Hint, if you are doing much work, you are making the problem harder than it needs to be.
Consider the dissociation of triprotic acid, H3Y: H3Y(aq) + H2O(l) <-----> H2Y-(aq) + H30+(aq)                         &nbsp
Consider the dissociation of triprotic acid, H3Y: H3Y(aq) + H2O(l) <-----> H2Y-(aq) + H30+(aq)                                  Ka1 = 2.0 x 10-4 H2A-(aq) + H2O(l) <-----> HY2-(aq) + H30+(aq)                                Ka2 = 8.0 x 10-8 HY2-(aq)+ H2O(l) <-----> Y3-(aq) + H30+ (aq)                                    Ka3 = 4.0 x 10-13 2H2O(l) <-----> H30+ + OH-                                                                Kw =[H30+][ OH-] = 1.0 x 10-14 Use the values of Ka1, Ka2, Ka3, and Kw and evaluate the equilibrium constant (Keq) associated with each of the three reactions below. Star with Ka1...
Calculate the pH and the equilibrium concentrations of H2PO4-, HPO42- and PO43- in a 0.0353 M...
Calculate the pH and the equilibrium concentrations of H2PO4-, HPO42- and PO43- in a 0.0353 M aqueous phosphoric acid solution. For H3PO4, Ka1 = 7.5×10-3, Ka2 = 6.2×10-8, and Ka3 = 3.6×10-13 pH = ? [H2PO4-] = ?M [HPO42-] = ?M [PO43-] = ?M
Phosphoric acid is a triprotic acid, and the Ka values are given below. Calculate pH, pOH,...
Phosphoric acid is a triprotic acid, and the Ka values are given below. Calculate pH, pOH, [H3PO4], [H2PO4 2-], [HPO4 -], and [PO4 3-] at equilibrium for a 5.00 M phosphoric acid solution. Ka1 = 7.5 x 10^-3 Ka2 = 6.2 x 10^-8 Ka3 = 4.2 x 10^-13
2The acid-dissociation constants of phosphoric acid (H3PO4) are Ka1 = 7.5 × 10-3, Ka2 = 6.2...
2The acid-dissociation constants of phosphoric acid (H3PO4) are Ka1 = 7.5 × 10-3, Ka2 = 6.2 × 10-8, and Ka3 = 4.2 × 10-13 at 25.0 °C. What is the molar concentration of phosphate ion in a 2.5 M aqueous solution of phosphoric acid? A) 0.13 B) 2.5 × 10-5 C) 8.2 × 10-9 D) 9.1 × 10-5 E) 2.0 × 10-19 Can you include the complete steps where Ka2 and Ka3 is used.
Phosphoric acid, H3PO4(aq), is a triprotic acid, meaning that one molecule of the acid has three...
Phosphoric acid, H3PO4(aq), is a triprotic acid, meaning that one molecule of the acid has three acidic protons. Estimate the pH, and the concentrations of all species in a 0.350 M phosphoric acid solution. pKa1= 2.16 pKa2=7.21 pKa3=12.32 [H3PO4]= [H2PO4-]= [HPO4^2-]= [PO4^3-] [H+]= [OH-]= pH=
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT