Answer:
pH of the solution after addition of 8 ml 0,296 molar HCl = 7.94
Explanation:
In this case buffer exist between hypochlorous acid HClO is a weak acid and its conjugate base hypochlorite ion ClO⁻ which are deliver to the solution by NaOCl ( sodium hypochlorite ).
The salt is completely dissociate
[NaOCl] = [ClO⁻]
Using Henderson equation to find pH of this buffer
pH = pKa + log![\frac{[Conjugate base]}{[Acid]}](https://tex.z-dn.net/?f=%5Cfrac%7B%5BConjugate%20base%5D%7D%7B%5BAcid%5D%7D)
or, = 7.53 + log
or, = 7.53 + 0.4
or, = 7.94
Answer:
1 mole
Explanation:
A mole of water molecules contains 2 moles of hydrogen atoms and 1 mole of oxygen atoms.
When a 10g sample of liquid water increases in temperature from 13°C to 18°C, then the amount of gained energy is 209 joules.
<h3>How do we calculate gained energy?</h3>
The amount of energy which is gained by any sample will be calculated as:
Q = mcΔT, where
Q = gained energy
m = mass of sample = 10g
c = specific heat of water = 4.18 J/g°C
ΔT = change in temperature = 18 - 13 = 5°C
On putting values we get
Q = (10)(4.18)(5)
Q = 209 Joules
Hence required amount of energy is 209 joules.
To know more about gained energy, visit the below link:
brainly.com/question/21704399