Which of the following sails arc/is basic? Na_2 SO_3 NaNO_2 NH_4 Cl 1 only 2 onl

Question

Which of the following sails arc/is basic? Na_2 SO_3 NaNO_2 NH_4 Cl 1 only 2 only 3 only 1 & 2 2 & 3 Use the Ka values below to answer the questions that follow. Ka (HX_1) = 1.0 times 10^-5 Ka (HX_2) = 1.0 times 10^-4 Ka (HX_3) = 1.0 times 10^-3 Which of the following is the strongest acid? HX_1 HX_2 HX_3 H_2 O Which of the following is the strongest base? X_1^- X_2^- X_3^- H_2 O What is the pH of a 0.10M NaOH solution? 0.1 1.0 12.0 13.0 13.9 What is the pH of a 0.10M H_2 SO_4 solution? Exactly 1.0 A little higher than 1.0 A little lower than 1.0 Exactly 13.0 Between 2.0 and 3.0

Explanation / Answer

Question 13.

salts will dissociate 100%

note that the products may or may not form hydrolysis with water

so:

Na2SO3 --> 2Na+ + SO3-2

Note that SO3-2 will hydrolyse:

SO3-2 + H2O <--> HSO3- + OH-. this is BASIC

b)

NaNO2 ---> NA+ + NO2-

NO2- + H2O <--> HNO2 + OH-

This is also basic

c)

NH4Cl --< NH4+ + Cl-

Note that NH4+ will donate H+ so

NH3 + H+ is acidic

So...

only Na2SO3 and NaNO2 are BASIC

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