Which of the following acid/base pairs would be best for making a buffer with a pH of 8.00?

1.Acid Formula Ka1 Ka2 Ka3 Acetic acid CH3COOH 1.8×10-5
2.Ascorbic acid H2C6H6O6 7.9×10-5 1.6×10-12
3.Carbonic acid H2CO3 4.2×10-7 4.8×10-11
4.Hydrocyanic acid HCN 4.0×10-10
5.Hydrofluoric acid HF 7.2×10-4
6.Hypochlorous acid HClO 3.5×10-8
7.Phosphoric acid H3PO4 7.5×10-3 6.2×10-8 4.8×10-13
8.Sulfurous acid H2SO3 1.7×10-2 6.4×10-8

Asolid that forms and separates from a liquid mixture is called

Cryolite, na3alf6(s), an ore used in the production of aluminum, can be synthesized using aluminum oxide. start this question by first balance the chemical equation.1.) balance the equation: - alo3(s)+naoh(l)+hf(> na3alf6+h2o(g). 2.) if 17.5 kilograms of al2o3(s), 51.4 kilograms of naoh(l), and 51.4 kilograms of hf(g) react completely, how many kilograms of cryolite will be produced? 3.)which reactants will be in excess, (al2o3, naoh, or hf) 4.)what is the total mass of the excess reactants left over after the reaction is complete in kg?

Is 343 in the sequence -5, -2, 1, 4, 7