Question

A tuer solution is made using a weak asi. . win upe, or on the end of a wo 10 10 x 10' what they A buffer solution is made using a weak acid, HA, with a pK, of 8.00. If the ratio of [A] to (HA) is 1.0 x 10'. what is the pH of the buffer? pH = 2.8

Answer 1

1)

Use:

pH = pKa + log ([A-]/[HA])

= 8.00 + log (1.0*10^1)

= 8.00 + 1.00

= 9.00

Answer: 9.00

2)

The compound is more soluble in acidic solution if it is basic

KNO3 is salt of Strong base (KOH) and Strong acid (HNO3)

Both acid and base are strong

So, the salt KNO3 is neutral

CdS is basic salt

HgI2 is salt of weak base and Strong acid (HI)

Only acid is strong

So, the salt HgI2 is acidic

NaClO4 is salt of Strong base (NaOH) and Strong acid (HClO4)

Both acid and base are strong

So, the salt NaClO4 is neutral

CaF2 is salt of Strong base (Ca(OH)2) and weak acid

Only base is strong

So, the salt CaF2 is basic

Answer: CaF2 and CdS