6. Which pair of substances produce a precipitate when their aqueous solution are mixed? A) barium nitrate, silver nitrate
B) sodium chloride, barium nitrate
C) sodium nitrate, barium chloride
D) sodium sulphate, barium chloride

The enthalpy of formation of water is -285.8 kj/mol. what can be inferred from this statement?

What is the mass of 8 moles of sodium atoms

Answer asap need it by wednesday morning carry out the following calculations on ph and ka of from data. i. calculate the ph of 0.02m hcl ii. calculate the ph of 0.036m naoh iii. calculate the ph of 0.36m ca(oh)2 iv. calculate the ph of 0.16m ch3cooh which has ka = 1.74 x 10-5 mol dm-3 v. calculate ka for weak acid ha which has a ph of 3.65 at 0.30m concentration vi. calculate the ka of a solution made by mixing 15.0 cm3 0.2m ha and 60.0 cm3 0.31m a-. [ph= 3.80] vii. calculate the ph of a solution made by mixing 15.0 cm3 0.1m naoh and 35.0 cm3 0.2m hcooh. [ka = 1.82 x 10-4 m]