I need help with these questions, especially the balancing ones. I think i\'m do

Question

I need help with these questions, especially the balancing ones. I think i'm doing them properly but i keep on getting answer choice 4 for the first one

Complete and balance this equation in acidic solution, adding H and H20 as needed. Using the smallest possible numbers, what is the coefficient of H'? (2) 4 (3) 3 (4) 2 (5) 12 6. Complete and balance this equation for reaction in basic solution, adding OH and H2O as needed. Using the smallest possible whole numbers, what is the coefficient of OH? -2 H202 +Cr(OH)s CrO4 (basic) (2) 5 (3) 2 (5) 0 7.Which one of these should be the weakest acid? (1) HCIO (as HOCI) (2) HCIO3 (as HOCIO2) (3) HIO (as HOI) (4) HIO3 (as HOIO2) 8. In a titration of 10.0 mL HCl sample the end point was detected after addition of 6.5 mL of 1.0 M NaOH. The concentration of HClin the sample is? (2) 1.3 M (3) 1.3x 103 M (4) 1.0x 102M (5) 0.01M 9. The pH during the titration of 100.00 mL of 0.1000 M phosphoric acid with 30.00 mL of 1.000M NaOH is closest to (ignore dilution): (3) 7.2 (4) 9.8 (5) 12.7

Explanation / Answer

Ans 5 : 1) 6

Start balancing the reaction, by seperating the reactions into oxidation and reductions half reactions.

Now balance all the other atoms , except hydrogen and oxygen . Now balance the hydrogen and oxygen atoms by adding protons and water molecules respectively into the half reactions.

Balance the charges and add the half reactions and then simplify.

S2O32- + 4HClO + H2O = 2SO42- + 4Cl- + 6H+

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