What is the oxidation number of Cl in Cl2? (include sign) What is the oxidation

Question

What is the oxidation number of Cl in Cl2? (include sign)

What is the oxidation number of Mn in Mn2+? (include sign)

What is the oxidation number of C in CH4? (include sign)

Which species is reduced in the reaction below?

Na+

Mg2+

What species is the oxidizing agent in the reaction below?

Cl2

Br2

Br-

Cl-

In the titration of NaOH with HNO2, what is the pH at the equivalence point?

In the titration of a weak acid with a strong base, what is the pH at the 1/2 equivalence point?

What volume (in milliliters) of 0.228 M HCl is required to completely neutralize 25.00 mL of 0.110 M Ba(OH)2?

Explanation / Answer

1)

for the 2Cl-: -1 per Cl atom
for the Cl2: [(+1) + (-1)] = 0 (no charge) Cl+Cl-

Explanation:

The chemical symbol 2Cl means that you have 2 moles of Cl ion. For an ion, the oxidation state is the charge. Since one chloride ion has a charge of -1, then that would be its oxidation state.

The overall oxidation state of the 2 moles Cl ion is, therefore, -2 (as 2 moles multiplied by the charge -1)

2)

What is the oxidation number of Mn in Mn2+? (include sign)

the oxidation number of Mn in Mn2+ is +2

Explain

MnSO4 = +2 ; KMnO4 = +7 ; K2MnO4 = +6

Explanation:

Oxidation number of SO4 = 2 , thus Mn = +2

Oxidation number of K = +1, thus MnO4 = 1
Mn+4 O = 1
Mn+4(2) = 1
Mn = +7

Oxidation number of K = +1, thus MnO4 = 2
Mn+4 O = 2
Mn+4(2) = 2
Mn = +6

So in Mn+2 Oxidation number is +2

3) What is the oxidation number of C in CH4? (include sign)

Answer:

Carbon has an Oxidation number of -4.

Explain

The hydrogen are acting as +1 each one of them, since there are 4 of them, the carbon has to be -4 to counter out the hydrogen positive charges.

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