An equation representing the reaction of a weak base w ith water is H_2CO_3 + H_

Question

An equation representing the reaction of a weak base w ith water is H_2CO_3 + H_2O ReverseEqulibrium H_2O^+ + HCOO^- NH_3 + H_2O ReverseEquilibrium NH_4^+ + OH^- NaOH + H_2O rightArrow Na^+ + OH^- + H_2O HCOOH + H_2O ReverseEquilibrium H_3O^+ HCOO^- None of the above represents the reaction of a weak base w ith water In order to change the pH of a solution from 2.0 to 4.0 the [H_3O^+] must increase by a factor of 2. decrease by a factor of 2. increase by a factor of 100. decrease by a factor of 100. decrease by a factor of 200. HCI is a strong electronic. A bottle of HCl contains the label 0.015 M HCl(aq), Which statement concerning this HCl solution is FALSE? The solution is acidic. The pH of the solution 1% 1.5. The hydromum ion concentration in this solution is 0.015 M. The solution has a higher concentration of hydromum iom than hydroxide ions. The solution contains dissolved H_3O+ and Cl^- ions only; no HCl molecules are present If the hydronium ion concentration of an aqueous solution at 25^degree C is 5.2 times 10^-4 M. what is the hydroxide ion concentration? 1.9 times 10^-11M 1.0 times 10^-7 M 5.2 times 10^-4 M zero 1.0 times 10^-4 M When a solution has pH = 5.30, the [H_3O^+] is 5.0 times 10^-6M 2.0 times 10^-9 M 0.72 M 13.27M 5.30 times 10^-3M

Explanation / Answer

13.

the term "base" is anything that will ACCEPT H+ ions from an acid; therefore:

in a; there is a weak acid, so ignore this

in b, is a good exmaple, sicne NH3 is a weak base, and accepts H+ ions from water, so OH- is free in solution

in c, this is storng acid, so ignore it

in d, we have a weak acid, so ignore it, since we need a weak base

then

choose B

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