What is kW equal to chemistry?
The autoionization of liquid water produces OH− and H3O+ ions. The equilibrium constant for this reaction is called the ion-product constant of liquid water (Kw) and is defined as Kw=[H3O+][OH−].
How do you calculate kW value?
- Kw is aka dissociation constant of water.
- It has been found experimentally that at 25 °C,
- [H+ ]=[OH-] and they both equal 1X10-7M.
- Since Kw= [H+ ][OH-] = [1X10-7M]2
- Then Kw = 1X 10-14.
What is kW in relation to pH?
Definition of pH and pOH
(Using [H3O+] is equivalent to using [H+].) The equilibrium constant, Kw, is called the dissociation constant or ionization constant of water. In pure water [H+] = [OH-] = 1.00×10-7 M. pH and pOH. Working with numbers like 1.00×10-7 M to describe a neutral solution is a rather inconvient.
How do you solve for pH with kW?
And we get a value of 1 times 10 to the negative 14. So water has a ion product constant that we refer to as kW. And at 25 degrees Celsius. We equate it to 1 times 10 to the negative 14.
Why is kW a constant?
Given that Kw equals to [H+][OH-], doesn’t concentration of these 2 differ in acids, water and alkali? Why is Kw only affected by temperature? Concentrations differ, of course, but their product does not. That’s why it is called a constant.
What is the formula of pH scale?
pH = −log ([H+])
pH is defined as the negative log base 10 of the hydronium concentration. The pH is a logarithmic measure of the concentration of hydrogen ions in a solution. Because pH is on a log scale that means that increasing the pH by 1 corresponds to multiplying the concentration of H+ ions by 10!
What is kilowatt power?
The Kilowatt
A kilowatt is simply a measure of how much power an electric appliance consumes—it’s 1,000 watts to be exact. You can quickly convert watts (W) to kilowatts (kW) by diving your wattage by 1,000: 1,000W 1,000 = 1 kW.
What is the value of KW What are its units?
Answer. Answer: 1 joule is equal to watt/second. The value of Kw is 1000 watt.
What pH is pure water?
7
Pure water has a pH of 7 and is considered “neutral” because it has neither acidic nor basic qualities.
Why is Kw a constant?
Is PKW always 14?
Kw is the equilibrium constant for autoprotolysis of water and represents the fact that the concentration of hydronium ions times the concentration of hydroxide ions will always equal 1.0 * 10-14. pKw is the negative log base 10 of Kw, so yes, it always equals 14, whether a solution is basic or acidic.
Why is the pH scale from 1 to 14?
The general definition of a solution’s pH value is the negative base-10 log of the solution’s hydronium ion concentration. While there is no more than 1M of hydroxide ions on the other hand, this results in a pH value not exceeding 14.
What has a pH of 14?
sodium hydroxide
A solution of a strong alkali, such as sodium hydroxide, at concentration 1 mol dm−3, has a pH of 14.
How many kW does a house use?
How much electricity does an American home use? In 2020, the average annual electricity consumption for a U.S. residential utility customer was 10,715 kilowatthours (kWh), an average of about 893 kWh per month.
How long will 10 kWh power a home?
Two popular systems on the market, for example, have capacities of 10 kilowatt-hours (kWh) and 13.5 kWh. With the average home drawing 750 to 1,000 W of power per hour during a blackout, the 10 kWh battery will last 10 to 12 hours and the 13.5 kWh battery will last 13.5 to 16.8 hours.
What is the kW of pure water at 50?
The Kw for pure water. changes from 1×10−14 at 25∘C to 5.5×10−14 at 50∘C.
What is the pH of blood?
Blood is normally slightly basic, with a normal pH range of about 7.35 to 7.45. Usually the body maintains the pH of blood close to 7.40.
What is best pH for drinking water?
between 6.5 and 8.5
EPA guidelines state that the pH of tap water should be between 6.5 and 8.5.
Why pH scale is up to 14 only?
Why does pH add up to 14?
The sum of pH and pOH is always 14. This is because the product of proton concentration and hydroxide concentration must always equal the equilibrium constant for the ionization of water, which is equal to . In this question, we know that the pOH is equal to 2.13, allowing us to solve for the pH.
What does a pH of 14 mean?
As this diagram shows, pH ranges from 0 to 14, with 7 being neutral. pHs less than 7 are acidic while pHs greater than 7 are alkaline (basic).
What is 14 on the pH scale?
The pH scale
Anything below 7.0 is acidic, and anything above 7.0 is alkaline, or basic. pH scale, ranging from 0 (very acidic) to 14 (very basic/alkaline) and listing the pH values of common substances.
Why does pH stop at 14?
Is there pH higher than 14?
But the scale does not have fixed limits, so it is indeed possible to have a pH above 14 or below zero. For example, concentrated hydrochloric acid can have a pH of around -1, while sodium hydroxide solution can have a pH as high as 15.
Is 50 kWh a day a lot?
But since most homes are comparable enough in size and we can’t control the weather, 50 kWh per day is a good number to use, though maybe a bit on the high end for some homes.