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PSC 4012

PSC 4012. Ionic Phenomena: A study of an environmental problem. PSC 4012: Neutralization & Indicators. PSC 4012: Neutralization & Indicators. Acids Red and blue litmus paper turn Red Arrhenius: acids release H + when dissolved in Water (aqueous solution)

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PSC 4012

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  1. PSC 4012 Ionic Phenomena: A study of an environmental problem

  2. PSC 4012: Neutralization & Indicators

  3. PSC 4012: Neutralization & Indicators Acids • Red and blue litmus paper turn Red • Arrhenius: acids release H+ when dissolved in Water (aqueous solution) HF (l) + H2O H+(aq) + F-(aq) H2SO4(l) + H2O 2H+(aq) + SO42-(aq) HI (l) + H2O H+(aq) + I-(aq)

  4. PSC 4012: Neutralization & Indicators Bases • Red and blue litmus paper turn Blue • Arrhenius: bases release OH- when dissolved in Water (aqueous solution) NaOH(s) + H2O Na+(aq) + OH-(aq) Mg(OH)2(s) + H2O Mg2+(aq) + 2OH-(aq) NH4OH (l) + H2O NH4+(aq) + OH-(aq)

  5. PSC 4012: Neutralization & Indicators Salts • Made of a metal ion and a non-metal ion • Red and blue litmus paper turn do not change colour • Neutral (pH = 7) • Arrhenius: salts release ions other than H+ and OH-when dissolved in Water (aqueous solution) NaCl(s)+ H2O Na+(aq) + Cl-(aq) CaCl2(s)+ H2O Ca2+(aq) + 2Cl-(aq) AgNO3(s)+ H2O Ag+(aq) + NO3-(aq)

  6. PSC 4012: Neutralization & Indicators Neutralization:

  7. PSC 4012: Neutralization & Indicators Neutralization:

  8. PSC 4012: Neutralization & Indicators • Acidic solution (pH = 1) • Add NaOH • pH increases (1 – 7) • Neutral solution (pH = 7) • Add NaOH • pH increases (7 – 14) • Basic solution (pH = 14) • Add HCl • pH decreases (14 – 7) • Neutral solution (pH = 7) • Add HCl • pH decreases (7 – 1) • Acid solution (pH = 1)

  9. PSC 4012: Neutralization & Indicators Practice: Ex. 6.15, p. 6.35 Ex. 6.16, p. 6.35

  10. PSC 4012: Neutralization & Indicators pH • Property that distinguishes acidic, basic and neutral solutions • Measures the concentration of H+ ions in solution • Can be determined by indicator, pH paper, pH meter, etc. • pH scale: 0 – 14 • pH < 7 (Acidic solution: Acids) • pH = 7 (Neutral solution: Salts) • pH > 7 (Basic solution: Bases)

  11. PSC 4012: Neutralization & Indicators Indicators: What is an indicator?!

  12. PSC 4012: Neutralization & Indicators Indicators:

  13. PSC 4012: Neutralization & Indicators Indicators: What is an indicator?! Substance whose colour changes according to the level of pH of the solution that it is added to

  14. PSC 4012: Neutralization & Indicators Indicators:

  15. PSC 4012: Neutralization & Indicators Indicators: The change of colour occurs in a range of pH (turning point) that is particular for every indicator. Fig 5.8, p. 5.47 Fig 5.9, p. 5.48

  16. PSC 4012: Neutralization & Indicators Practice: Ex. 5.34 & 5.35 p. 5.49

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