To melt the ice on your driveway, you can use two moles of rock salt (NaCl) or two moles of calcium chloride (CaCl2). Which solu
2 answers:
because it produces more moles of solute particles per mole of compound.
<u>Explanation:</u>
Freezing point depression depend on the "amount of solute particles" . Freezing point is also a colligative property. As we know, calcium chloride will dissociate into 3 particles whereas sodium chloride dissociate into only 2 particles. So, an aqueous solution calcium chloride would be effective than sodium chloride.
Also the water's boiling point with calcium chloride is higher. So is considered as a good road salt since it produces more ions per formula unit of salt that is dissolved than NaCl
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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.
