H3PO4 ----------------> H2PO4- + H+
0.40 0 0
0.40 - x x x
Ka1 = [x][x]/[0.40-x]
6.92 x 10^-3 = x^2/(0.40-x)
x = 0.0493
[H3PO4] = 0.40 - 0.0493 = 0.351M
[H2PO4-] = x = 0.0493 M
[H+] = x = 0.0493M
almost maximum H+ ions comes from first ionisation so
pH = -log [H+] = -log(0.0493)
pH= 1.31
[OH-] = kw/[H+] = 1 x10^-14/0.029
[OH-] = 2.03 x10^-13 M
H2PO4- -----------------> HPO4^2- + H+
0.0493 0 0.0493
0.0493-y y 0.0493+y
Ka2 =[HPO4^2][ H+]/[H2PO4-]
6.2 x10^-8 = (y)(0.0493+y)/(0.0493-y)
by solving this y = 6.2 x10^-8
second ionisation constant value always =[HPO4^-2]
[H2PO4-]= 0.029-y = 0.029-6.2 x10^-8
[HPO4^-2] =6.17 x10^-8 M
[H2PO4-] = 0.0493 M
HPO4^2 ---------------------> PO4^-3 + H+
6.2 x10^-8 0 0.0493
6.2 x10^-8- z z 0.0493 +z
Ka3 = [ PO4^-3][H+]/[HPO4^2]
4.7 x 10^-13 = (z) x(0.0493 +z)/ (6.2 x10^-8- z )
z= 5.91 x 10^-19 M
[PO4^-3] = z= 5.91 x 10^-19 M
Ka=10^-pKa Phosphoric acid, H_3PO_4(ag), is a triprotic acid, meaning that one molecule of the acid has...
Phosphoric acid, H,PO (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 0.300 M phosphoric acid solution. pkalpK42 2.16 7.21 PK 23 12.32 H,PO4) = [H,P0] = M [OH") = HPO ) = M pH = | PO]=
Phosphoric acid, H,PO (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 0.200 M phosphoric acid solution. pKalpKq2pKa3 2.16 7.21 12.32 (H2PO2) = M [H+= [H,P02] = M [OH-]= [HPO-1 = M pH=C pH = [PO]=
pKalpKa2 2.16 7.21 pKa3 12.32 Phosphoric acid, H2PO4 (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. [H2PO4) = (H+) =( M M 7m [H, PO1 = [OH-] = M [HPO4) = MpH = [PO] = M
Phosphoric acid, H 3 P O 4 ( 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 0.300 M phosphoric acid solution. pkalpKa2 12.16 7.21 pK23 12.32 Phosphoric acid, H,PO (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 0.300 M phosphoric...
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 0.500 M phosphoric acid solution. pKa1= 2.16 pKa2 = 7.21 pKa3 = 12.32 What's: H3PO4, H2PO4-, HPO4-2, PO4-3, H+ ,OH- , pH
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 0.300 M phosphoric acid solution. pKa1 pKa2 pKa3 2.16 7.21 12.32 [H3PO4]= M [H^+]= M [H2PO4 ^−]= M [OH^−]= M [HPO4 ^2−]= M pH= [PO4 ^3−]= M
Phosphoric acid, H,PO (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 0.150 M phosphoric acid solution. pKq1 2.16 p Kq2 7.21 PK 3 12.32 | | | [H2PO4) = MH*) =( [H,PO,] = M (OH) = (HPO )= M pH = [PO-1=
1. Phosphoric acid, H3PO4 is a triprotic acid with pKsı = 2.14 and pKa = 7.20 and pkas 12.38. Draw the titration curve predicted for 0.1 M phosphoric acid titrated by 0.1 M NaOH. (Assume the volume of acid is 20. mL) 2. The pKb of the acetate ion is 9.25. a. Using this information, calculate the pKa of acetic acid. b. Using the Henderson-Hasselbalch equation, calculate the ratio of the concentration of acetate to acetic acid required to produce...
Complete this table of values for four aqueous solutions at 25 "C HT] o] pH pOH Given Number Number Number 112.9 x 10-8 |M| | Solution A: Number Given Number Number Solution B: Number Number Given Number Solution C: In 4.97 Number Number Number Given Solution D: 11 □ 4.37 Given a diprotic acid, H2A, with two ionization constants of Kat = 1.5x10-4 and K2-4.4x10-11, calculate the pH for a 0.210 M solution of NaHA. Number Phosphoric acid, H3PO4(aq), is...
8. Phosphoric acid H3(PA) is a triprotic molecule that can be present in solution in the following forms. H3(PA), H2(PA)-, H(PA)-2, H(PA)-3 pts) Phosphoric acid HPAIS a tiorotic moiecule that can be presen in soludon in the following foms Hat PA, HaPA HIPAFAY The pK, values for Hi(PA) are the following: pK 2.148 pK2 7.198 pK3 12.375 a) What is the principal form when the solution pH 5.35? b) What is the second most abundant form of TBA at pH...