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    when the concentration of hydrogen ions in a solution is decreased by a factor of ten, the ph of the solution

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    Concentrations and strengths of acids

    Learn about and revise acids and alkalis with this BBC Bitesize GCSE Chemistry (Edexcel) study guide.

    Bitesize GCSE Edexcel

    Acids and alkalis

    Part of

    Chemistry (Single Science)Chemical changes

    Concentrations and strengths of acids - Higher

    Concentrations and strengths of acids - Higher Dilute and concentrated solutions

    A solution forms when a solute dissolves in a solvent. The concentration of a solution is a measure of how 'crowded' the solute particles are. The more concentrated the solution, the more particles it contains in a given volume.

    When solutions are described as dilute or concentrated:

    a dilute solution contains a relatively small amount of dissolved solute

    a concentrated solution contains a relatively large amount of dissolved solute

    Take care to use the word 'dilute' correctly. It can be used as an adjective to describe the concentration of a solution (as here), or as a verb to describe the process of adding more water to a solution to decrease its concentration.

    Strong and weak acids

    Acids in solution are a source of hydrogen ions, H+. The hydrogen ions are produced when the acid dissociates or breaks down to form ions.

    Strong acids

    Strong acids completely dissociate into ions in solution. For example, hydrochloric acid is a strong acid. It completely dissociates to form hydrogen ions and chloride ions:

    HCl(aq) → H+(aq) + Cl-(aq)

    Nitric acid and sulfuric acid are also strong acids.

    Weak acids

    Weak acids only partially dissociate into ions in solution. For example, ethanoic acid is a weak acid. It only partially dissociates to form hydrogen ions and ethanoate ions:

    CH3COOH(aq) ⇌ H+(aq) + CH3COO-(aq)

    The ⇌ symbol is used in the equation to show that the reaction is a reversible reaction, and does not go to completion.

    pH and hydrogen ion concentration

    The pH of a solution is a measure of its concentration of hydrogen ions:

    the higher the concentration of H+ ions in an acidic solution, the lower the pH

    the lower the concentration of H+ ions in an acidic solution, the higher the pH

    If the hydrogen ion concentration in a solution increases by a factor of 10, the pH of the solution decreases by 1.

    pH of alkaline solutions

    The higher the concentration of OH- ions in an alkaline solution, the higher the pH.

    Example

    A solution of 1 g/dm3. hydrochloric acid has a pH of 1.6. Predict its pH when it is diluted to 0.1 g/dm3.

    The hydrogen ion concentration decreases by a factor of 10, so the pH increases by 1 from 1.6 to 2.6.

    Question

    A solution of hydrochloric acid, with a concentration of 2 g/dm3, has a pH of 1.3. Predict its pH when it is diluted to make a solution with a concentration of 0.02 g/dm3.

    Move on to Test

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    Electrolysis - Edexcel

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    When the concentration of hydrogen ions in a solution is decreased by a factor of ten, the pH of the solution

    When the concentration of hydrogen ions in a solution is decreased by a factor of ten, the pH of the solution? >>

    When the concentration of hydrogen ions in a solution is decreased by a factor of ten, the pH of the solution

    When the concentration of hydrogen ions in a solution is decreased by a factor of ten, the pH of the solution

    This is a List of Available Answers Options :

    increases by 1 increases by 10 decreases by 1 decreases by 10

    The best answer is A. increases by 1.

    Reported from teachers around the world. The correct answer to ❝When the concentration of hydrogen ions in a solution is decreased by a factor of ten, the pH of the solution❞ question is A. increases by 1.

    I Recommend you to read the next question and answer, Namely A reaction between an alcohol and an organic acid is classified as with very accurate answers.

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    acid base indicators and pH

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    QUIZ

    acid base indicators and pH

    acid base indicators and pH 58%

    54 10th - 12th 10th - 12th Chemistry Angela Fuller 2 years

    33 Qs

    1. Multiple-choice 1 minute Q.

    When the concentration of hydrogen ions in a solution is decreased by a factor of ten, the pH of the solution

    answer choices increases by 1 increases by 10 decreases by 1 decreases by 10 2. Multiple-choice 1 minute Q.

    What is the pH of a solution that has a hydronium ion concentration 100 times greater than a solution with a pH of 4?

    answer choices 5 2 3 6 3. Multiple-choice 1 minute Q.

    As an acidic solution is added to a basic solution, the pH of the basic solution

    answer choices decreases increases remains the same 4. Multiple-choice 1 minute Q.

    Solution A has a pH of 3 and solution Z has a pH of 6. How many times greater is the hydronium ion concentration in solution A than the hydronium ion concentration in solution Z?

    answer choices 100 3 2 1000 5. Multiple-choice 1 minute Q.

    Adding 0.1 M NaOH to a 0.1 M solution of HCl will cause the pH of the solution to

    answer choices decrease increase remain the same 6. Multiple-choice 1 minute Q.

    When the pH of a solution is changed from 4 to 3, the hydronium ion concentration of the solution

    answer choices

    decreases by a factor of 10

    increases by a factor of 10

    decreases by a factor of 100

    increases by a factor of 100

    7. Multiple-choice 1 minute Q.

    . As the pH of a solution is changed from 3 to 6, the concentration of hydronium ions

    answer choices

    increases by a factor of 3

    increases by a factor of 1000

    decreases by a factor of 3

    decreases by a factor of 1000

    8. Multiple-choice 1 minute Q.

    What is the color of bromcresol green indicator in a solution with a pH value of 2.0?

    answer choices blue green red yellow 9. Multiple-choice 1 minute Q.

    The acidity or alkalinity of an unknown aqueous solution is indicated by its

    answer choices pH value

    electronegativity value

    percent by mass concentration

    percent by volume concentration

    10. Multiple-choice 1 minute Q.

    As HCl(g) is added to water, the pH of the water solution

    answer choices decreases increases remains the same 11. Multiple-choice 1 minute Q.

    Which of these pH numbers indicates the highest level of acidity?

    answer choices 5 8 12 10 12. Multiple-choice 1 minute Q.

    Which of these 1 M solutions will have the highest pH?

    answer choices NaOH CH3OH HCl NaCl 13. Multiple-choice 1 minute Q.

    Which pH indicates a basic solution?

    answer choices 1 5 7 12 14. Multiple-choice 1 minute Q.

    When the pH of an aqueous solution is changed from 1 to 2, the concentration of hydronium ions in the solution is

    answer choices

    decreased by a factor of 2

    decreased by a factor of 10

    increased by a factor of 2

    increased by a factor of 10

    15. Multiple-choice 1 minute Q.

    Which of the following pH values indicates the highest concentration of hydronium ions in a solution?

    answer choices pH = 1 pH = 2 pH = 3 pH = 4 16. Multiple-choice 1 minute Q.

    Which statement describes the characteristics of an Arrhenius base?

    answer choices

    It changes blue litmus to red and has a pH less than 7.

    It changes blue litmus to red and has a pH greater than 7.

    It changes red litmus to blue and has a pH less than 7.

    It changes red litmus to blue and has a pH greater than 7.

    17. Multiple-choice 1 minute Q.

    . Given the equation representing a reaction at equilibrium: NH3(g) + H2O(l) NH4+(aq) + OH–(aq)

    If an acid is defined as an H+ donor, what is the acid in the forward reaction?

    answer choices OH–(aq) H2O(l) NH3(g) NH4+(aq) 18. Multiple-choice 1 minute Q.

    As 0.1 M HCl is added to 0.1 M KOH, the pH of the basic solution

    answer choices

    decreases and basicity decreases

    increases and basicity decreases

    decreases and basicity increases

    increases and basicity increases

    19. Multiple-choice 1 minute Q.

    A solution with a pH of 2.0 has a hydronium ion concentration ten times greater than a solution with a pH of

    answer choices 1.0 0.20 3.0 20 20. Multiple-choice 1 minute Q.

    Which change in pH represents a hundredfold increase in the concentration of hydronium ions in a solution?

    answer choices pH1 to pH 2 pH 1 to pH 3 pH 2 to pH 1 pH 3 to pH 1 21. Multiple-choice 1 minute Q.

    Compared to a solution with a pH value of 7, a solution with a thousand times greater hydronium ion concentration has a pH value of

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