ch302 notes ch7.1 - CH302 Chapter 7 notes part 1 ACIDS and...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
CH302 Chapter 7 notes part 1 ACIDS and BASES What’s an Acid? Acids turn litmus RED Acidic solutions will conduct electricity Acids react with some metals and make H 2(g) IF A FOOD ACID (e.g. lemon juice) it will taste sour DO NOT EVER test non-food acids this way! What’s a Base? Bases turn litmus BLUE Basic solutions will conduct electricity Foods which are basic taste bitter DO NOT EVER test non-food bases this way! Bases have a slippery feeling (e.g. soap, baking soda) DO NOT test ANY other bases this way! What’s an Acid? Arrhenius definition (simplest) : something which breaks apart ( ionizes or dissociates ) to give a negative ion and a positive hydrogen ion. Hydrogen Chloride gas dissolves in water to make HYDROCHLORIC ACID: HCl (g) HCl (aq) H + (aq) + Cl - (aq) See later: These IONS do not float around naked… What’s a Base? Arrhenius definition (simplest) : something which breaks apart ( ionizes or dissociates ) to give a positive ion and a hydroxide ion. Sodium Hydroxide dissolves in water: NaOH (s) NaOH (aq) Na + (aq) + OH - (aq) Again, these IONS do not float around naked….but we usually write them this way. Better Acid/ Base Definitions Arrhenius definition too limiting: Brønstead-Lowry definition: An ACID is a PROTON DONOR A BASE is a PROTON ACCEPTOR This means that in aqueous solutions, water ITSELF acts as an acid and a base. HCl as a Brønstead-Lowry acid ( here, water acts as a Brønstead-Lowry base) H+ ions and the anions do not exist as isolated ions but are surrounded by water molecules
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
NH 3 as a Brønstead-Lowry base ( here, water acts as a Brønstead-Lowry acid) Again the ions do not exist as isolated ions but are surrounded by water molecules, its just easier to leave them out of the equation. Generic Acid Dissociation:
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 5

ch302 notes ch7.1 - CH302 Chapter 7 notes part 1 ACIDS and...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online