Answer:
a. The phenolphthalein acts as a color changing indicator to signal the endpoint of the reaction.
Explanation:
Phenolphthalein is an organic substance with chemical formula .
It is a substance commonly used in acid-base titrations to indicate the end point in the titration because phenolphthalein is colorless in acidic solutions but turns a purplish-pink color in basic solutions.
In this way it helps visually to notice when the final point of the titration has been reached.
Answer:
Robert Boyle
Explanation:
Robert Boyle was an Irish chemist and is famously referred to as the first modern chemist. He was born on the 25th of January, 1627 in Lismore, Ireland and died on the 31st, December 1691, London, United Kingdom.
Robert Boyle was the first to determine the relationship between the pressure and volume of a gas.
Boyles states that when the temperature of an ideal gas is kept constant, the pressure of the gas is inversely proportional to the volume occupied by the gas.
Mathematically, Boyles law is given by;
Where;
V1 and V2 represents the initial and final volumes respectively.
T1 and T2 represents the initial and final temperatures respectively.
Answer : The volume of solution required is, 2.93 L
The number of moles of formed from the reaction is, 0.662 moles.
Explanation :
First we have to calculate the initial moles of .
Now we have to calculate the moles of
The balanced chemical reaction is:
From the balanced chemical reaction we conclude that,
As, 1 mole of react with 2 moles of
So, 0.662 mole of react with
moles of
Now we have to calculate the volume of
Now we have to calculate the moles of
From the balanced chemical reaction we conclude that,
As, 1 mole of react to give 1 moles of
So, 0.662 mole of react to give 0.662 moles of
Thus, the number of moles of formed from the reaction is, 0.662 moles.