0.1 M solution of which one of these substances will be basic ?
Sodium borate
Calcium nitrate
NH4Cl
Sodium sulphate
Which of the following molecules acts as a Lewis acid ?
(CH3)3B
(CH3)2O
(CH3)3P
(CH3)3N
Which one of the following is true for any diprotic acid H2X?
Ka2=Ka1
Ka2>Ka1
Ka2< Ka1
Ka2= 1 / Ka1
Solubility of a M2S type salt is 3.5 ×10-6, then find out its solubility product
1.7 ×10-6
1.7×10-16
1.7 ×10-18
1.7 ×10-12
The compound whose aqueous solution has the highest pH is
NaCl
NaHCO3
Na2CO3
NH4 Cl
The strongest conjugate base is
NO3-
Cl-
SO4 2-
CH3COO-
What is the [OH-] in the final solution prepared by mixing 20.0 mL of 0.050 M HCl with 30.0 mL of 0.10 M Ba(OH)2?
0.10 MNumber of milliequivalents of HCl =20×0.050×1=1Number of milliequivalents of Ba(OH)2 = 2×30×0.10=6[OH-] of final solution = milliequivalents of Ba(OH)2 - milliequivalents of HCl / Total volume = 6 - 1 / 50=0.1 M
0.40 M
0.0050 M
0.12 M
A Physician wishes to prepare a buffer solution at pH =3.58 that efficiently resist changes in pH yet contains only small concentration of the buffering agents. Which one of the following weak acid together with its sodium salt would be best to use ?
m-chlorobenzoic acid (pKa=3.98)
P-Chlorocinnamic acid(pKa = 4.41)
2,5 -dihydroxy benzoic acid (pKa=2.97)
Acetoacetic acid(pKa=3.58)
Which has highest pH ?
CH3COOK
NaNO3
The solubility of a saturated solution of calcium fluoride is 2×10-4 mol / L . Its solubility product is,
12×10-2
14×10-4
22×10-11
32×10-12