A student measured the pH of four solutions. Which pH indicates the highest hydronium ion concentration?
2 answers:
Answer: Option (a) is the correct answer.
Explanation:
It is known that pH is the negative log of concentration of hydrogen ions.
Mathematically, pH =
For acidic solutions, pH will range fro 1 to 6.9. When a solution is neutral in nature then its pH will be equal to 7.
Lesser is the value of pH, more will be the hydrogen ion concentration present into the solution and vice-a-versa.
On the other hand, when pH will range from 7.1 to 14 then the solution will be basic in nature.
Therefore, we can conclude that a solution with pH equal to 3.2 indicates the highest hydronium ion concentration.
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Answer:
Compound B has greater molar mass.
Explanation:
The depression in freezing point is given by ;
..[1]
Where:
i = van't Hoff factor
= Molal depression constant
m = molality of the solution
According to question , solution with 5.00 g of A in 100.0 grams of water froze at at lower temperature than solution with 5.00 g of B in 100.0 grams of water.
The depression in freezing point of solution with A solute:
Molar mass of A =
The depression in freezing point of solution with B solute:
Molar mass of B =
As we can see in [1] , that depression in freezing point is inversely related to molar mass of the solute.
This means compound B has greater molar mass than compound A,