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raj1234

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  1. Asked: October 18, 2020In: Class 10

    Under what soil condition do you think a farmer would treat the soil of his fields with quick lime (calcium oxide) or slaked lime (calcium hydroxide) or chalk (calcium carbonate)?

    raj1234
    Added an answer on February 1, 2021 at 4:40 pm

    When the soil is acidic and improper for agriculture, then to increase the basicity of soil, the farmer would treat the soil with quick lime or slaked lime or chalk.

    When the soil is acidic and improper for agriculture, then to increase the basicity of soil, the farmer would treat the soil with quick lime or slaked lime or chalk.

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  2. Asked: October 18, 2020In: Class 10

    Do basic solutions also have H+(aq) ions? If yes, then why are these basic?

    raj1234
    Added an answer on February 1, 2021 at 4:39 pm

    Yes, the basic solution also has H+ ions. However, H+ concentration is less as compared to the concentration of OH− ions so the solution is basic.

    Yes, the basic solution also has H+ ions. However, H+ concentration is less as compared to the concentration of OH− ions so the solution is basic.

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  3. Asked: October 18, 2020In: Class 10

    What effect does the concentration of H+(aq) ions have on the nature of the solution?

    raj1234
    Added an answer on February 1, 2021 at 4:38 pm

    Concentration of H+ can have a varied effect on the nature of the solution. H+ ion concentration increases, the solution becomes more acidic, while a decrease of H+ ion causes an increase in the basicity of the solution.

    Concentration of H+ can have a varied effect on the nature of the solution. H+ ion concentration increases, the solution becomes more acidic, while a decrease of H+ ion causes an increase in the basicity of the solution.

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  4. Asked: October 18, 2020In: Class 10

    You have two solutions, A and B. The pH of solution A is 6 and pH of solution B is 8. Which solution has more hydrogen ion concentration? Which of this is acidic and which one is basic?

    raj1234
    Added an answer on February 1, 2021 at 4:36 pm

    When pH value is less than 7 it indicates an acidic solution, while greater than 7 it indicates a basic solution. Therefore, the solution A with pH = 6 is acidic and has more hydrogen ion concentration than the solution B of pH=8 which is basic.

    When pH value is less than 7 it indicates an acidic solution, while greater than 7 it indicates a basic solution. Therefore, the solution A with pH = 6 is acidic and has more hydrogen ion concentration than the solution B of pH=8 which is basic.

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  5. Asked: October 18, 2020In: Class 10

    How is the concentration of hydroxide ions (OH–) affected when excess base is dissolved in a solution of sodium hydroxide?

    raj1234
    Added an answer on February 1, 2021 at 4:35 pm

    When excess base is dissolved in a solution of sodium hydroxide. The concentration of hydroxide ions (OH-) would increase.

    When excess base is dissolved in a solution of sodium hydroxide. The concentration of hydroxide ions (OH–) would increase.

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  6. Asked: October 18, 2020In: Class 10

    How is the concentration of hydronium ions (H3O+) affected when a solution of an acid is diluted?

    raj1234
    Added an answer on February 1, 2021 at 4:34 pm

    When an acid gets diluted, the concentration of hydronium ions (H3O+) per unit volume decreases. This means that the strength of the acid decreases when it gets diluted.

    When an acid gets diluted, the concentration of hydronium ions (H3O+) per unit volume decreases. This means that the strength of the acid decreases when it gets diluted.

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  7. Asked: October 18, 2020In: Class 10

    While diluting an acid, why is it recommended that the acid should be added to water and not water to the acid?

    raj1234
    Added an answer on February 1, 2021 at 4:33 pm

    Dissolving an acid in water is an exothermic reaction, it is always recommended that acid should be added to water, in this case heat produced is not sufficient to burn out, if we add acid to water then it is possible that because of the large amount of heat generated, the mixture splashes out and cRead more

    Dissolving an acid in water is an exothermic reaction, it is always recommended that acid should be added to water, in this case heat produced is not sufficient to burn out, if we add acid to water then it is possible that because of the large amount of heat generated, the mixture splashes out and causes burns.

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  8. Asked: October 18, 2020In: Class 10

    Why does dry HCl gas not change the colour of the dry litmus paper?

    raj1234
    Added an answer on February 1, 2021 at 4:31 pm

    Dry HCl gas does not contain H+ ions in the aqueous condition only an acid dissociates to give ions. Hence, their is no change in the colour of the litmus paper.

    Dry HCl gas does not contain H+ ions in the aqueous condition only an acid dissociates to give ions. Hence, their is no change in the colour of the litmus paper.

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  9. Asked: October 18, 2020In: Class 10

    Why does an aqueous solution of an acid conduct electricity?

    raj1234
    Added an answer on February 1, 2021 at 4:30 pm

    In aqueous solutions acids dissociate to form ions. These ions conduct electricity. In dry condition acid does not dissociate to form ions.

    In aqueous solutions acids dissociate to form ions. These ions conduct electricity. In dry condition acid does not dissociate to form ions.

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  10. Asked: October 18, 2020In: Class 10

    Why do HCl, HNO3, etc., show acidic characters in aqueous solutions while solutions of compounds like alcohol and glucose do not show acidic character?

    raj1234
    Added an answer on February 1, 2021 at 4:28 pm

    HCl or HNO3  shows acidic character on aqueous solution because hydrogen ions  dissociation always occurs in the presence of water. Hydrogen ions (H+) when combined  with H2O to form hydronium ions (H3O+). The reaction is as follows: HCL(aq)  →  H+ + CL- H+ + H2O → H3O+ Whereas aqueous solutions ofRead more

    HCl or HNO3  shows acidic character on aqueous solution because hydrogen ions  dissociation always occurs in the presence of water. Hydrogen ions (H+) when combined  with H2O to form hydronium ions (H3O+).

    The reaction is as follows:

    HCL(aq)  →  H+ + CL–

    H+ + H2O → H3O+

    Whereas aqueous solutions of glucose and alcohol contain hydrogen, these cannot dissociate in water to form hydrogen ions. Therefore they do not show acidic character.

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