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Deepak Rock
@deepak-rock
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Joined: Aug 6, 2021
Last seen: Sep 10, 2021
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Topics: 1742 / Replies: 303
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Topic
Do basic solutions also have H^+(aq) ions? If yes, then why are they basic? (b) When a solution becomes more acidic, does the pH get higher or lower?
4 years ago
Forum
Acids, bases and salt
Replies: 0
Views: 91
Topic
Separate the following into substances having pH values above and below 7. How do these influence litmus paper?
4 years ago
Forum
Acids, bases and salt
Replies: 0
Views: 131
Topic
What do you think will be the pH in the stomach of a person suffering from indigestion less than 7 or more than 7? (b) What do you think will be the pH of an antacid solution less than 7 or more than 7?
4 years ago
Forum
Acids, bases and salt
Replies: 0
Views: 275
Topic
What would you expect the pH of pure water to be? (b) What colour would the universal indicator show in an aqueous solution of sugar? Why?
4 years ago
Forum
Acids, bases and salt
Replies: 0
Views: 124
Topic
What ions are present in the solutions of following substances? (write the symbols only) Hydrochloric acid Nitric acid Sulphuric acid
4 years ago
Forum
Acids, bases and salt
Replies: 0
Views: 243
Topic
What is meant by strong bases and weak bases? Classify the following into strong bases and weak bases : NH4OH, Ca(OH)2, NaOH, KOH, Mg(OH)2
4 years ago
Forum
Acids, bases and salt
Replies: 0
Views: 105
Topic
The soil in a field is highly acidic. Name two materials which can be added to this soil to reduce its acidity. Give the reason for your choice.
4 years ago
Forum
Acids, bases and salt
Replies: 0
Views: 144
Topic
Which acid is produced in our stomach? What happens if there is an excess of acid in the stomach? How can its effect be cured?
4 years ago
Forum
Acids, bases and salt
Replies: 0
Views: 232
Topic
Under what soil conditions do you think a farmer would treat the soil of his fields with quicklime (calcium oxide), Or slaked lime (calcium hydroxide), or chalk (calcium carbonate)?
4 years ago
Forum
Acids, bases and salt
Replies: 0
Views: 294
Topic
The pH of a cold drink is 5. What will be its action on blue and red litmus solutions? (b) The pH values of three acids A, B and C having equal molar concentrations are 5.0,2.8 and 3.5 respectively.
4 years ago
Forum
Acids, bases and salt
Replies: 0
Views: 209
Topic
The pH values of six solutions A to F are given below: A = 0, B = 11, C = 6, D = 3, E = 13, F = 8 Which of the above solutions are (i) acids (ii) alkalis? (b) Name the acids or alkalis used to make
4 years ago
Forum
Acids, bases and salt
Replies: 0
Views: 274
Topic
What does the pH of a solution signify? Three solutions A, B and C have pH values of 6, 4 and 10 respectively. Which of the solutions is highly acidic? (b) A farmer has found that the pH of soil in his fields is 4.2.
4 years ago
Forum
Acids, bases and salt
Replies: 0
Views: 268
Topic
(a) Why is it wrong to treat a bee sting with vinegar? (b) Why is it wrong to treat a wasp sting with baking soda solution?
4 years ago
Forum
Acids, bases and salt
Replies: 0
Views: 125
Topic
What happens during a bee sting? What is its remedy? (b) What happens during a wasp sting? What is its remedy?
4 years ago
Forum
Acids, bases and salt
Replies: 0
Views: 145
Topic
Explain the pH change as the cause of tooth decay. How can tooth decay caused by pH change be prevented? (b) Explain how pH change in the lake water can endanger the lives of aquatic animals (like fish).
4 years ago
Forum
Acids, bases and salt
Replies: 0
Views: 388
Topic
Which chemical is injected into the skin of a person: (a) during an ant’s sting? (b) during the nettle leaf hair sting? How can the effect of these stings be neutralised?
4 years ago
Forum
Acids, bases and salt
Replies: 0
Views: 117
Topic
What is a universal indicator? For what purpose is it used? (b) How does a universal indicator work?
4 years ago
Forum
Acids, bases and salt
Replies: 0
Views: 279
Topic
Fresh milk has a pH of 6. When it changes into curd (yogurt), will its pH value increase or decrease? Why?
4 years ago
Forum
Acids, bases and salt
Replies: 0
Views: 86
Topic
Acids have a pH………… than 7. (b) Alkalis have a pH………. than 7. (c) Neutral substances have a pH of
4 years ago
Forum
Acids, bases and salt
Replies: 0
Views: 99
Topic
Two solutions X and Y have pH = 4 and pH = 8, respectively. Which solution will give alkaline reaction and which one acidic?
4 years ago
Forum
Acids, bases and salt
Replies: 0
Views: 327
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