It was called Pangaea. That is what he called it. <span />
<span>Answer:
Nothing is balanced in your final equation: not H, not O, not Cr, not I and your charges aren't either.
Start with your 2 half reactions:
I- --> IO3-
Cr2O72- --> 2 Cr3+
Balance O by adding H2O:
I- + 3 H2O --> IO3-
Cr2O72- --> 2 Cr3+ + 7H2O
Balance H by adding H+:
I- + 3 H2O --> IO3- + 6 H+
Cr2O72- + 14 H+ --> 2 Cr3+ + 7H2O
Balance charge by adding e-:
I- + 3 H2O --> IO3- + 6 H+ + 6 e-
Cr2O72- + 14 H+ + 6 e- --> 2 Cr3+ + 7H2O
Since the numbers of electrons in your two half reactions are the same, just add them and simplify to give:
Cr2O72- + I- + 8 H+ --> IO3- + 2 Cr3+ + 4 H2O</span>
The valency of nitride and magnesium is incorrect
Answer:
pH range = 2.74-4.74
Explanation:
The pH range of a buffer falls in between one unit on either side of pKa.
The given weak acid is HF and its Ka = 1.8X10⁻⁴
pKa = -log(Ka)
pKa = -log(1.8X10⁻⁴)
pKa = 3.74
The pH range is 3.74-1 = 2.74 to 3.74+1 =4.74
pH range = 2.74-4.74