PYQSidePowered by
ExamsMy practice
If 1 mM solution of ethylamine produces pH=9, then the ionization constant (Kb) of ethylamine is 10-x. The value of x is (nearest integer). [The degree of ionization of ethylamine can be neglected with respect to unity.]
7
Concept: Kb C 2 and [OH-]=C ⇒ Kb= [OH-]2C
pH=9 pOH=5 [OH-]=10-5 M, C=10-3 M
Kb= 10-1010-3=10-7 ⇒ x=7
Answer: 7
pH of water is 7 at 25 C. If water is heated to 80 C, it's pH will :
Consider the reaction X2Y(g) X2(g) + 12Y2(g) The equation representing correct relationship between the degree of dissociation (x) of X2Y(g) with its equilibrium constant Kp is . Assume x to be very very small.
A vessel at 1000 K contains CO2 with a pressure of 0.5 atm. Some of CO2 is converted into CO on addition of graphite. If total pressure at equilibrium is 0.8 atm, then Kp is :
The molar solubility(s) of zirconium phosphate with molecular formula ( Zr4+ )3 ( PO43- )4 is given by relation :