Mix 2g of hydrogen and 16g of oxygen what is the compound made

The name of the ion, s2-, is: sulfurous ion sulfide ion sulfur ion sulfate ion

If you add 5.00 ml of 0.100 m sodium hydroxide to 50.0 ml of acetate buffer that is 0.100 m in both acetic acid and sodium acetate, what is the ph of the resulting solution? acetic acid: ka = 1.8. x 10-5

What is the ph of a solution that has a hydrogen ion concentration of 1.0 * 10 -9 m?