Iron + --> iron sulphate + copper What is missing ? Iron sulphate Copper sulphate Copper oxideIron oxide
1 answer:
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Answer:
a. A buffer solution reacts with basic solutions.
c. A buffer solution reacts with acidic solutions.
e. A buffer solution resists small changes in pH
Explanation:
1. Buffer questions
a, c, and e are TRUE. A buffer resists a change in the pH when small amounts of a strong acid or base are added to it.
b is wrong. A buffer can have a pH of 7, but it can also have many other pH values.
d is wrong. Most buffers are colourless, and they resist a change in pH.
2. Titration curves
The solution is the best buffer at the mid-point of the titration curve.
In the figure below, the equivalence point is at 13 mL, so the mid-point is at 6.5 mL.
The solution is buffered at pH 3.2.
However, the solution is a buffer at any point in the range pH = 3.2 ± 1.
That would be in the range of 1 mL to 12 mL.
The buffering ability becomes worse the further you are from the mid-point of the titration.
Answer: The coefficients for the given reaction species are 1, 6, 2, 3.
Explanation:
The given reaction equation is as follows.
Now, the two half-reactions can be written as follows.
Reduction half-reaction:
This will be balanced as follows.
... (1)
Oxidation half-reaction:
This will be balanced as follows.
... (2)
Adding both equation (1) and (2) we will get the resulting equation as follows.
Thus, we can conclude that coefficients for the given reaction species are 1, 6, 2, 3.