Explanation:
The value of 
:
![K_w=[H^+][OH^-]](https://tex.z-dn.net/?f=K_w%3D%5BH%5E%2B%5D%5BOH%5E-%5D)
a. pOH = 3.51
The sum of pH and pOH is equal to 14.
pH + pOH = 14 (at 25°C)
pH = 14 - 3.51 = 10.49
The pH of the solution is defined as negative logarithm of hydrogen ion concentration in solution.
![pH=-\log[H^+]](https://tex.z-dn.net/?f=pH%3D-%5Clog%5BH%5E%2B%5D)
![10.49=-\log[H^+]](https://tex.z-dn.net/?f=10.49%3D-%5Clog%5BH%5E%2B%5D)
![[H^+]=3.2\times 10^{-11}](https://tex.z-dn.net/?f=%5BH%5E%2B%5D%3D3.2%5Ctimes%2010%5E%7B-11%7D)
is the 
concentration for an aqueous solution with pOH = 3.51 at 25°C.
b.
At a certain temperature, the pH of a neutral solution is 7.56.
Neutral solution means that concentration of hydrogen ion and hydroxide ions are equal.
![[H^+]=[OH^-]](https://tex.z-dn.net/?f=%5BH%5E%2B%5D%3D%5BOH%5E-%5D)
![7.56=-\log[H^+]](https://tex.z-dn.net/?f=7.56%3D-%5Clog%5BH%5E%2B%5D)
![[H^+]=2.754\times 10^{-8} M](https://tex.z-dn.net/?f=%5BH%5E%2B%5D%3D2.754%5Ctimes%2010%5E%7B-8%7D%20M)
The value of at at this temperature:
![K_w=[H^+][H^+]](https://tex.z-dn.net/?f=K_w%3D%5BH%5E%2B%5D%5BH%5E%2B%5D)
The value of at at this temperature is 
.
Answer:
Sample B
Explanation:
When heat is added to a substance, the molecules and atoms vibrate faster. Since the speed for Sample B is higher this means it has a higher temperature as well.
Answer: Correct option is B)
The standard enthalpy change of formation of a compound is the enthalpy change which occurs when one mole of the compound is formed from its elements under standard conditions. The equation showing the standard enthalpy change of formation of water is
H
2
(g)+
2
1
O
2
(g)⟶H
2 ↑
O(l) 1 mole of water formed.
∴ Enthalpy of formation is −X2kJ/mol.
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Explanation:I hope this helped
Answer:
eat healthy, exercise, be kind to yourself, things like that
