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(a). What is a universal indicator? For ...

(a). What is a universal indicator? For what purpose is it used?
(b). How does a universal indicator work?
(c). Water is a neutral substance. What colour will you get when you add a few drops of universal indicator to a test-tube containing water?

Text Solution

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(c) green colour
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What will be the colour acquired by a basic solution if a few drops of indicator methyl orange are added to it ?

(a). What is an indicator? Name three common indicators. (b). Name the acid-base indicator extracted from lichen. (c). What colour does the turmeric paper turn when put in an alkaline solution.?.

(a). What effect does the concentration of H^(+) (aq) ions have on the nature of a solution? (b). What effect does the concentration of OH^(-) ions have on the nature of a solution? (c). Someone put some universal indicator paper into vinegar. The pH is 3. What does this tell you about the vinegar? (d). Someone put some universal indicator paper onto wet soap. the pH is 8. What does this tell you about the soap? (e). State whether a solution is acidic, alkali or neutral if its pH is: (i) 9 (ii) 4 (iii) 7 (iv) 1 (v) 10 (vi) 3.

(a). 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? (c). A sample of rain water turned universal indicator paper yellow. What would you expect its pH to be? Is it a strong or a weak acid?

(a) Define a universal indicator. Mention its one use. (b) Solution A gives pink colour when a drop of phenolphthalein indicator is added to it. Solution B gives red colour when a drop of methyl orange is added to it. What type of solutions are A and B which one of the solutions A and B will have a higher pH value ? (c) Name one salt whose solutions has pH more than 7 and one salt whose solution has pH less than 7.

(a) Define a universel indicator. Mention its one use. (b) Solution A gives pink colour when a deop of phenolphthalein indicator is added to it. Solution B gives a red colour when a drop of methyl orange is added to it. What type or solution are A and B and which of these will have higher pH value ? (c) Name one salt whose solution has pH less then 7 and one salt with pH more than 7.

LAKHMIR SINGH & MANJIT KAUR-ACID, BASES AND SALTS-Exercise
  1. Fill in the following blanks with suitable words (a). Acids have a p...

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  2. Fresh milk has a pH of 6. How do you think the pH will change as it tu...

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  3. (a). What is a universal indicator? For what purpose is it used? (b)...

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  4. Which chemical is injected into the skin of a person. (a). During an...

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  5. (a). Explain the pH change as the cause of tooth decay. How can tooth ...

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  6. (a). What happens during a bee sting? What is its remedy? (b). What ...

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  7. (a). Why is it wrong the treat a bee sting with vinergar? (b). Why i...

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  8. (a). What does the pH of a solution signify? Three solutions A, B and ...

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  9. (a). The pH values of six solutions A to F are given below: A=0, B=1...

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  10. (a). The pH of a cold drink is 5. What will be its action on blue and ...

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  11. Under what soil conditions do you think a farmer would treat the soil ...

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  12. Which acid is produced in our stomach ? What happens if there is an ex...

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  13. The soil in a field is highly acidic. Name two materials which can be ...

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  14. What is meant by strong bases and weak bases? Classify the following i...

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  15. What ions are present in the solutions of following substances? (write...

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  16. (a). What would you expect the pH of pure water to be? (b). What col...

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  17. (a). What do you think will be the pH in the stomach of a person suffe...

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  18. Separate the following into substances having pH values above and belo...

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  19. (a). Do basic solutions also have H^(+)(aq) ions? If yes, then why are...

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  20. (a). What happens when zinc granules are heated with sodium hydroxide ...

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