What is the hydroxide ion concentration of a solution with a ph of 8. 25?
1 answer:
The concentration of hydroxide ion of a solution with a pH of 8. 25 is 1.77× M
Calculation,
The pH of a solution tells us about concentration of the ion ( proton ) in solution. However, if we know the value of pH , we can calculate pOH with the help of pH and from pOH we can find concentration of hydroxide ions in the solution.
pH + pOH = 14
8. 25 + pOH = 14
pOH = 14 - 8. 25 = 5.75
Since, pH = -㏒[ ]
Similarly, pOH = -㏒[ ]
If pOH = 5.75 , that means that -㏒[ ] = 5.75 ,which means that,
[ ] =
= 1.77×
.
So, we know that the concentration of the ions in the solution with pH of 8.25 is 1.77×
Molar
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Answer:
b)15.0°C
Explanation:
Specific Heat of Water=4.2 J/g°C
This means, that 1 g of Water will take 4.2 J of energy to increase its temperature by 1°C.
∴80 g Water will take 80×4.2 J of energy to increase its temperature by 1°C.
80×4.2 J=336 J
Total Energy Provided=1680 J
The temperature increase=\frac{\textrm{Total energy required}}{\textrm{energy required to increase temperature by one degree}}
Temperature increase=
=5°C
Initial Temperature =10°C
Final Temperature=Initial + Increase in Temperature
=10+5=15°C