To a solution of hydrochloric acid, 3 drops of methyl orange is added. what will be the change in the colour of the solution? why?
Answers
The problem with those is that they do not distinguish between acidic and basic medium, but rather between different pHs. MO has a transition interval of 3.1-4.4, which means it's red below 3.1 and yellow over 4.4. Within this interval it's all about transition colors (red through orange to yellow).
Answering your question: a few drops of HCl would affect water differently. Let's say, you had 1L of water and you added 3 drops (0.15 mL) of concentrated saturated HCl (~40% w/w). That leads us to ~0.002 mol of HCl added and to pH lower than 3, so the MO would turn red. If you had diluted solutions, like 0.01M or so, the calculations would tell you the pH would still be higher than 4.4, so the MO would still be yellow.
Answer:
Hey mate...
Explanation:Brainly.in
What is your question?
dhakatanishqddun
Secondary SchoolChemistry 5+3 pts
To a solution of hydrochloric acid, 3 drops of methyl orange is added. what will be the change in the colour of the solution? why?
Report by Narendrakumarsingh 05.07.2018
Answers
dhakatanishqddun
Dhakatanishqddun · Expert
Know the answer? Add it here!
Mainak33 Helping Hand
Methyl orange (MO), as you know, is an acid-base indicator.
The problem with those is that they do not distinguish between acidic and basic medium, but rather between different pHs. MO has a transition interval of 3.1-4.4, which means it's red below 3.1 and yellow over 4.4. Within this interval it's all about transition colors (red through orange to yellow).
Answering your question: a few drops of HCl would affect water differently. Let's say, you had 1L of water and you added 3 drops (0.15 mL) of concentrated saturated HCl (~40% w/w). That leads us to ~0.002 mol of HCl added and to pH lower than 3, so the MO would turn red. If you had diluted solutions, like 0.01M or so, the calculations would tell you the pH would still be higher than 4.4, so the MO would still be yellow
.