Biology. Properties of Water And Acids/Bases (pH) SB1.d. Explain the impact of water on life processes. Why is water important to humans?. 2/3 of the weight of a cell is WATER! Look at all the important uses of water in the body…. What properties of water make it so useful and important?.
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Properties of Water
SB1.d. Explain the impact of water on life processes.
a. Has a slight charge on each end.
b. One side of water is “+” and the other side is “-”
c. This polarity enables water to dissolve many substances
2. Water is called “Universal solvent”:
a. Differences in charges pulls/pushes substances apart so they dissolve
3.Water is cohesive & adhesive which creates surface tension
Cohesive- water molecules stick to each other
Adhesive- water molecules stick to other surfaces
Surface tension- like a skin of water
Ex: how some insects walk on water
Surface tension created by cohesiveness of water
4. Water moves by capillary action
5. Water exhibits evaporative cooling:
6. Water expands during freezing:
Measures the concentration of Hydrogen (H+) ions in a solution
1. release H+ when mixed with water
2. 0-6 on pH scale
3. Sour, corrosive
4. Always have H at front of formula
5. Ex: HCl is hydrochloric acid
What is a BASE?
1. release hydroxide (OH-) when mixed with water
2. 8-14 on pH scale
3. Bitter, slippery, usually in cleaners
4. Always have OH at end of formula
5. Ex: NaOH is sodium hydroxide
Neutral: H+ ions and OH- ions are equal so it is neutral. They are 7 on pH scale.
1. Body chemicals that prevent sharp changes in pH so keep solution neutral
2. Help to control pH in blood, digestive tract, etc. to maintain homeostasis