HBr(aq) + Na_2S(aq) rightarrow HCIO_4 (aq) + CO_3 (aq) Complete and balance each

Question

HBr(aq) + Na_2S(aq) rightarrow HCIO_4 (aq) + CO_3 (aq) Complete and balance each gas-evolution equation: HNO_3(aq) + Na_2SO_3 (aq) rightarrow HCl(aq) + KHCO_3 (aq) rightarrow HC_2H_3O_2(aq) + NaHSO_3(aq) rightarrow (NH_4)_2 SO_4 (aq) + Ca(OH)_2 (aq) rightarrow Oxidation-Reduction and Combustion Assign oxidation states to each atom in each element, ion, or compound. Ag Ag^+ CaF_2 H_2S CO_3^2- CrO_4^2- Assign oxidation states to each atom in each element, ion, or compound. CI_2 Fe^3+ CuCI_2 CH_4 Cr_2O_7^2- HSO_4 What is the oxidation state of CI in each compound? CrO CrO_3 Cr_2O_3 What is the oxidation state of Cl in each ion? CIO^- CIO_4^- CIO_3^- CIO_4^- Determine whether each reaction is a redox reaction. For each redox reaction, identify the oxidizing agent and the reducing agent. The density of a 20.0% by mass ethylene glycol (C_2H_6O_2) solution in water is 1.03 g/mL. Find the molarity of the solution. Find the percent by mass of sodium chloride in a 1.35 M NaCI

Explanation / Answer

87)
a)
Any element will have oxidation state of 0
Answer: 0

b)
any ion of element has oxidation state same as charge on ion
Answer: +1

c)
This is compound formed by Ca2+ and F-
So,
oxidation state of Ca is +2
oxidation state of F is -1

d)
This is compound formed by H+ and S-2
So,
oxidation state of S is -2
oxidation state of H is +1

e)
CO3 2-
oxidation state of O is -2
let oxidation state of C be x
x + 3*-2 = net charge
x - 6 = -2
x = +4
oxidation state of C is +4

f)
oxidation state of O is -2
let oxidation state of Cr be x
x + 4*-2 = net charge
x - 8 = -2
x = +6
oxidation state of Cr is +6

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