Shows how temperature affects the conductivity of water
Uses the endothermic ionization of water equation to explain effects of temperature
Shows how temperature affects the equilibrium in water
Shows how temperature affects hydronium ion and hydroxide ion concentrations, as well as the value of Kw.
www.BCLearningN....
0:01turn
0:03here will examine how temperature affect the ionization
0:07a blotter the conductivity of water
0:10could be measured with a very sensitive meter a low-temperature
0:14the conductivity of water is very low but if we turn the hot plate on high
0:20the temperature increases the conductivity of water
0:24also increased so at a higher temperature
0:28the conductivity of pure water is slightly higher
0:32than it was at a low temperature the conductivity of water
0:37arises from the hydrazone and and hydroxide ions that
0:41form when water ionizers remember the concentrations up high grozny am
0:47and hydroxide or very low that's why water is such a poor conductor
0:52at 25 degrees Celsius the concentration of idoney Amanda concentration hydroxide
0:58are both one times tend to the -7 molar
1:02and the conductivity of water is very low
1:07however when the temperature and water is increased to 60 degrees
1:11the hydrazone mine concentration and the hydroxide ion concentration
1:15both increased to about 3.1 times tend to the -7 smaller
1:20and the conductivity of water is a little higher
1:25so we can say
1:25arise by saying that when the temperature of water is increased
1:30the concentration of hydrazone I'm and the concentration of hydroxide
1:34both increase
1:36and the conductivity of water increases
1:39this can all be explained if we realized that the ionization a water is
1:43endothermic
1:45he termed can be written on the left side to the ionization equation
1:50increasing the temperature ads he to this equilibrium system
1:55according to worship tally is principal equilibrium
1:58will counteract the addition if he'd by shifting to the right
2:04as the shift to the right occurs the hydrazone a.m.
2:07and hydroxide ion concentrations increase
2:11water is a liquid so its concentration does not change
2:16happy to ship a new equilibrium is established
2:19which the concentration of hydrazone I'm and the concentration of hydroxide are
2:23both higher than they were
2:25before the ship
2:27is important to realize that when the temperature increases
2:31the concentration idoney Amanda concentration at hydroxide
2:35increased by the same I'm out
2:38and the concentration of idoney M and the concentration of hydroxide
2:42remain equal to each other
2:44therefore water remains neutral
2:47now we'll examine how temperature affects the value
2:50kW remember kW is the product at the concentrations of hydrazone I'm
2:55and hydroxide
2:57and at 25 degrees the value kW is one times tend to -14
3:04but if we increase the temperature about 25 degrees
3:07equilibrium ships to the right
3:10so the car
3:11by Jonny amend the Constitution and By Dre oxide are both higher than they were
3:15at 25 degrees
3:18so their product kW will be greater than one times tended to -14
3:25going back to 25 degrees the value kW
3:28was one time stand in the negative 14
3:32if we were to decrease the temperature to below 25 degrees
3:35this would remove heat from the system
3:39equilibrium would compensate by shifting to the left
3:43the concentration idoney I'm and cons treatment hydroxide
3:46would both be lower than they were at 25 degree
3:51and their product kW would be less than 1 times tend to the negative
3:5514
3:57now will summarize hot temperature affects the concentration of hydrazone M
4:01the concentration and hydroxide and KW
4:05when the temperatures 25 degrees Celsius
4:08the concentration idoney M and the concentration abide Rockside
4:12are both want times tend to be -7 smaller
4:16but the concentration of hydrazone and is still equal to the concentration of
4:19hydroxide
4:21so the water still neutral
4:24kW is equal to the product at the concentration in Patagonia
4:27and the concentration of hydroxide
4:30which is one times tended to -14
4:33now will go to 60 degrees which is higher than 25
4:38it has been found that it's 60 degrees the concentration up idoney M
4:42and the concentration of hydroxide
4:44are both 3.1 times tend to the -7
4:47molar
4:49even though they're both higher than you were at 25 degrees
4:52they are still equal to each other
4:55so the water is still neutral
4:57kW is equal to the product at the concentration by drone EM
5:01and the concentration hydroxide
Негізгі бет WCLN - Effect of Temperature on Ionization of Water - Chemistry
Пікірлер