Question

An aqueous solution of an unknown solute is tested with litmus paper and found to be basic. The solution is weakly conducting compared with a solution of NaCl of the same concentration. Which of the following substances could the unknown be:

a. H3PO3

b. CH3COCH3

c.NH3

d.HNO3

e. NaOH

2. 20.0 mL of a 2.2 M lead (II) nitrate solution is mixed with 100.0 mL of a 0.75 M magnesium sulfate solution. What is the mass of the precipitate that forms?

What is the concentration of nitrate ions in the resulting solution?

3.If 82.1 mL of hydrobromic acid solution is neutralized by titrating with 57.5 mL of 3.00 M baroum hydroxide solution what is the concentration of the HBr solution?

Answer 1

(1) it's a base and conductance is less than NaCl the it wiil be NH₃

_{For 2 and 3 qution see images below:}