1) Common house hold cleaners contain aqueous solution of ammonia. a particular

Question

1) Common house hold cleaners contain aqueous solution of ammonia. a particular solution of household ammonia had a pH of 11.90. what is the pOH? what are the concentrations of hydronic and hydroxide ions in the solution? is it an acid or base?

2) an average cup of coffee from Starbucks has a hydroxide ion concentration of 1.1 × 10^-9 M. what is the pH, pOH and concentration of the hydronic ions in that cup of coffee? is it an acid or a base? ( in this problem the ionization of water has already taken place)

3) using information in your text what is the concentration if all species in a 0.5 solution of citric acid.

4) determine if the following salts acid really acid recidivism, basic, or neutral and explain or show equations why.
a. KNO3
b. NACL
c. H3PO4
d. NaCl

Explanation / Answer

Q1-.

NH3 is ammonia

pH = 11.90

so

14 = pH + pOH

then, solve for pOH

pOH = 14-pH = 14-11.90 = 2.1

find

hydronic and hydroxie

[H3O+] = 10^-pH = 10^-11.90 = 1.258*10^-12

[OH-] = 10^-pOH = 10^-2.1 = 0.0079432

Q2.

[OH-] = 1.1*10^-9

pOH = -log(1.1*10^-9)= =8.9586

pH = 14-8.9586 = 5.0414

so...

this is celarly ACIDIC

[H+] = 10^-ph = 10^-5.0414 = 0.00000909075

[OH-] = 10^-14 / 0.00000909075 = 1.10001*10^-9

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