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 _________________

Answer 1

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