Water And pH Flashcards
What gives water much of its unique characteristics ?
Hydrogen bonds
What are the 4 properties of water?
- Water is an excellent polar solvent
- Water has cohension
- Water has high heat capacity
- Water has high heat vaporization
Is water polar or non polar?
Polar
What do polar molecules dissolve in?
Water
What makes water the best polar solvent?
Its abilityto formhydrogen bonds with other molecules
What is a solution?
Two substances that are mixed together. One of them is called the solute and the other is the solvent
In sugar water which substance is the solute and which is the solvent?
Sugar is the solute and water is the solvent
What is a solute?
The substance to be dissolved
What is a solvent?
The substance doing the dissolving
What is cohesion ?
Gives water the capacity to resist breaking under tension
Why is cohesion so important?
Allows blood to move easier in the blood vessels
What happens when you increase the temperature of something?
The molecules in it move faster, hydrogen bonds keep the water molecules in place so it takes lots of energy to break the bonds and heat the water
What happens to hydrogen bonds when water changes from liquid to vapor?
Hydrogen bonds must be broken
Sweat is an example of which property of water?
High heat of vaporization
What is an acid?
Substances that donates hydrogen ions when in a solution
What is a base?
Substances that accept hydrogen ions when in solution (sometimes we say that bases release OH- hydroxyl ions)
Ph is described as having a _____ relationship
Inverse
Anything below 7 on ph scale is _______
Acidic
The higher the ph the _______ the concentration of H+
Lower
True or false: The higher the ph solution has the higher the H+ concentration
False
Is a ph of 8 acidic or basic?
Basic
The H+ concentration of a solution with a pH of 4 is\_\_\_\_\_\_ (higher/lower) than a solution of 2 A. 10x higher B. 100x higher C. 10x lower D. 100x lower
D. 100x lower
What is the job of a buffer?
Prevent dramatic changes in pH, remove excess H+ solutions when concentrations of H+ increase, add H+ when concentratioons of H+ decrease
In salt water which is considered the solute?
Salt
