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ACIDS AND BASES www.lab-initio.com. Properties  electrolytes  turn litmus red  sour taste  react with metals to form H 2 gas  slippery feel  turn.

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Presentation on theme: "ACIDS AND BASES www.lab-initio.com. Properties  electrolytes  turn litmus red  sour taste  react with metals to form H 2 gas  slippery feel  turn."— Presentation transcript:

1 ACIDS AND BASES www.lab-initio.com

2 Properties  electrolytes  turn litmus red  sour taste  react with metals to form H 2 gas  slippery feel  turn litmus blue  bitter taste ChemASAP  vinegar, milk, soda, apples, citrus fruits  ammonia, lye, antacid, baking soda

3 Acids are Proton (H + ion) Donors Strong acids are assumed to be 100% ionized in solution (good H + donors). Weak acids are usually less than 5% ionized in solution (poor H + donors). HCl H 2 SO 4 HNO 3 H 3 PO 4 HC2H3O2HC2H3O2 Organic acids

4 Acids Have a pH less than 7

5 Acids Taste Sour  Citric acid in citrus fruit  Malic acid in sour apples  Lactic acid in sour milk and sore muscles  Butyric acid in rancid butter Organic acids are weak acids. Some are used as flavoring agents in food.

6 Acids Effect Indicators Blue litmus paper turns red in contact with an acid. Methyl orange turns red with addition of an acid

7 Acids React with Active Metals Acids react with active metals to form salts and hydrogen gas. Mg + 2HCl  MgCl 2 + H 2 (g) Zn + 2HCl  ZnCl 2 + H 2 (g) Mg + H 2 SO 4  MgSO 4 + H 2 (g)

8 Acids React with Carbonates 2HC 2 H 3 O 2 + Na 2 CO 3 2 NaC 2 H 3 O 2 + H 2 O + CO 2

9 Effects of Acid Rain on Marble (calcium carbonate) George Washington: BEFORE George Washington: AFTER

10 Acids Neutralize Bases HCl + NaOH  NaCl + H 2 O Neutralization reactions ALWAYS produce a salt and water. H 2 SO 4 + 2NaOH  Na 2 SO 4 + 2H 2 O 2HNO 3 + Mg(OH) 2  Mg(NO 3 ) 2 + 2H 2 O OH - (hydroxide) in base combines with H + in acids to form water H + + OH -  H 2 O

11 Definitions  Brønsted-Lowry HCl + H 2 O  Cl – + H 3 O + AcidsAcids are proton (H + ) donors. BasesBases are proton (H + ) acceptors. conjugate acid conjugate base baseacid

12 Definitions H 2 O + HNO 3  H 3 O + + NO 3 – CBCAAB

13 Definitions - can be an acid or a base.  Amphoteric - can be an acid or a base. NH 3 + H 2 O  NH 4 + + OH - CACBBA

14 Definitions F - H 2 PO 4 - H2OH2O HF H 3 PO 4 H 3 O +  Give the conjugate base for each of the following: (these are acids)

15 Definitions Br - HSO 4 - CO 3 2- HBr H 2 SO 4 HCO 3 -  Give the conjugate acid for each of the following: (these are bases-accept protons)

16 Acid/Base Definitions TypeAcidBase Bronsted- Lowry H+ donorH+ acceptor

17 Properties of Bases  Bases are proton (hydrogen ion, H + ) acceptors  Bases have a pH greater than 7  Bases taste bitter  Effects on indicators-  Red litmus turns blue  Phenolphthalein turns purple  Solutions of bases feel slippery  Bases neutralize acids

18 Bases are Proton (H + ion) Acceptors  Sodium hydroxide (lye), NaOH  Potassium hydroxide, KOH  Magnesium hydroxide, Mg(OH) 2  Calcium hydroxide (lime), Ca(OH) 2

19 Bases have a pH greater than 7

20 Bases Effect Indicators Red litmus paper turns blue in contact with a base. Phenolphthalein turns bright pink in a base.

21 Bases Neutralize Acids Milk of Magnesia contains magnesium hydroxide, Mg(OH) 2, which neutralizes stomach acid, HCl. 2 HCl + Mg(OH) 2 MgCl 2 + 2 H 2 O


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