I. Litmus Paper Observations 1. Report color change for the 0.010M M HCl solutio
ID: 494557 • Letter: I
Question
I. Litmus Paper Observations
1. Report color change for the 0.010M M HCl solution:
Red Litmus Paper:
Blue Litmus Paper:
2. Report color change for the 0.010M M NaOH solution:
Red Litmus Paper:
Blue Litmus Paper:
II. Properties of Acid-Base Indicators
1. Phenolphthalein
Report the color in 0.010 M HCl solution:
Report color change on addition of drops of NaOH solution:
Report color change on addition of drops of the HCl solution:
2. Bromocresol Green
Color in 0.010 M HCl solution.
Report color change on addition of drops of NaOH solution
Report color change on addition of drops of HCl solution:
C. Methyl Red
Color in 0.010 M HCl solution.
Report color change on addition of drops of NaOH solution:
Report color change on addition of drops of HCl solution:
III. Titration of a Strong Acid with a Strong Base
Concentration of NaOH solution: ___________________
Determination #1
Volume of HCl solution added to flask (mL) -25.88
Initial Buret Reading (mL) -50
Final Buret Reading (mL) -24.12
Determination #2
Volume of HCl solution added to flask (mL) -25.61
Initial Buret Reading (mL)-50
Final Buret Reading (mL)-24.39
Determination #3
Volume of HCl solution added to flask (mL) -26.7
Initial Buret Reading (mL) -50
Final Buret Reading (mL) -23.0
Calculations
Determination #1, Calculation of molarity of HCl solution:
Determination #2, Calculation of molarity of HCl solution:
Determination #3, Calculation of molarity of HCl solution:
Average of your three determinations _________________
Explanation / Answer
A) Color Change with 0.01M HCl
Red Litmus - remains red Blue Litmus - turns red
B) Color Change with 0.01M NaOH
Red litmus - turns blue Blue litmus - remains blue
C) Color change with Phenolphthalein
When added to HCl - Phenolphthalein color changes from pink to colourless
On addition of drops of NaOH - colorless to dark pink color (when added in excess)
On addition of drops of HCl- pink color fades and ultimately becomes colorless
D) Color change with Bromocresol Green
When added to HCl - from Green color of bromocresol Green to yellow
On addition of drops of NaOH - Yellow to green if addition is done to neutralise the acid , and when added in excess then Blue
On addition of drops of HCl- Blue to green for neutralising the base and when added in excess then yellow
E) Color change with Methyl Red
When added to HCl - Red color
On addition of drops of NaOH - red to yellow
On addition of drops of HCl- yellow to red