Question

the average human contains 5.0 liters of blood having a pH of 7.35. calculate the number of moles of H3O+ at 25 degree celsius

Answer 1

The number of moles of H3O+ in blood can be calculated using the pH value and volume of blood. The pH of blood is typically around 7.4, which corresponds to a concentration of 10^(-7.4) M. Multiplying this concentration by the volume of blood gives us the number of moles of H3O+.

Step-by-step explanation:

The pH of blood is typically around 7.4. To calculate the number of moles of H3O+ in blood at 25 degrees Celsius, we need to convert the pH value to the H3O+ concentration. The pH scale is logarithmic, so a pH of 7.4 represents a concentration of 10^(-7.4) M. Given that blood has an average volume of 5.0 liters, we can calculate the number of moles of H3O+ by multiplying the concentration by the volume:

Number of moles = Concentration x Volume = 10^(-7.4) M x 5.0 L = 3.98 x 10^(-6) moles H3O+

Answer 2

Answer : The number of moles of hydronium ion is,
`2.2* 10^(-7)mole`

Explanation :

First we have tom calculate the concentration of hydrogen ion or hydronium ion.

pH : It is defined as the negative logarithm of hydrogen ion or hydronium ion concentration.

`pH=-\log [H_3O^+]`

Given:

pH = 7.35

`7.35=-\log [H_3O^+]`

`[H_3O^+]=4.47* 10^(-8)mol/L`

Now we have to calculate the moles of hydronium ion.

`\text{Moles of }H_3O^+=\text{Molarity of }H_3O^+* \text{Volume of solution}`

Now put all the given values in this expression, we get:

`\text{Moles of }H_3O^+=(4.47* 10^(-8)mol/L)* (5.0L)`

`\text{Moles of }H_3O^+=2.2* 10^(-7)mole`

Therefore, the number of moles of hydronium ion is,
`2.2* 10^(-7)mole`