Please help me with this chem question it’s due by midnight. I know the answer choice isn’t C.

Which compound contains both ionic and covalent bonds? a) hbr b)cbr4 c)nabr d) naoh

Using a value of ksp = 1.8 x 10-2 for the reaction pbcl2 pb+2(aq) + 2cl -(aq). if the value of ksp was determined to be only 1.2 x 10-2: too much solid has dissolved. additional precipitate is forming. the solution is unsaturated. the ions are now combining to reduce their concentrations.

0.09 moles of sodium sulfate in 12 ml of solution