Advertisements
Advertisements
प्रश्न
A student prepares solutions of (i) an acid and (ii) a base in two separate beakers. She forgot to label the solutions and litmus paper is not available in the laboratory. Since both the solutions are colourless, how will she distinguish between the two?
उत्तर
Phenolphthalein and methyl orange are also acid-base indicators. They can be used in place of litmus.
Procedure : Transfer a portion of the colourless solutions to two glass tubes. Add one or two drops of phenolphthalein indicator to these. An acid solution will remain colourless while the solution of base will become pink. Now, repeat the experiment with methyl orange indicator. In acid solution, the indicator will become reddish while in base, it will be yellowish.
APPEARS IN
संबंधित प्रश्न
Do basic solutions also have H+ (aq) ions? If yes, then why are these basic?
Two solutions X and Y have pH = 4 and pH = 8, respectively. Which solution will give alkaline reaction and which one acidic?
Fill in the following blank with suitable words:
Alkalis have a pH.............. than 7.
What would you expect the pH of pure water to be?
What colour would the universal indicator show in an aqueous solution of sugar? Why?
What do you think will be the pH in the stomach of a person suffering from indigestion: less than 7 or more than 7?
When a solution becomes more acidic, does the pH get higher or lower?
Someone put some universal indicator paper onto wet soap. The pH is 8. What does this tell you about the soap?
In acidic solution, the colour of the hibiscus indicator paper will change to _____.
State whether the following statements are true or false. Correct the false statements.
Phenolphthalein is a natural indicator.
