Chapter 2 : pH and water Flashcards
Polar molecules ____ in water
dissolve
What can water dissolve ?
Polar and charged molecules
Solution definition
Two substances mixed together
Solute definition
Substance to be dissolved (sugar)
Solvent definition
The one doing the dissolving (water)
In salt water , Salt is the ____?
Solute
( smaller amount)
Cohesion definition
Similar things attract together
(water molecules cling together)
Cohesion with water does what?
Gives water capacity to resist breaking under tension
Why is Cohesion important?
Cohesion in water allows blood to move easier in blood vessels
(also moves water in plants)
Acid definition
Substance that donates hydrogen ions when in solution
(gives up H+)
Base definition
Substance that accepts hydrogen ions when in solution
(accepts H+)
Inverse definition
Higher the pH the lower the concentration of H+
Logarithmic definition
Increase in pH represents 10x decrease in H+ concentration
Ph scale :
Below 7 is what ?
Acidic
Ph scale :
At 7 is what ?
Neutral