What is the pOH of a substance with a Hydrogen concentration of 3.45 x 10-9. suppose to be a small 9

Chemistry

2 answers:

DerKrebs [107]2 years ago

6 0

Answer:

The correct answer is option d.

Explanation:

Concentration of hydrogen ions = $[H^+}=3.45\times 10^{-9} M$

The pH of the solution is given by :

$pH=-\log[H^+]$

$pH=-\log[3.45\times 10^{-19}]=8.46$

The relation between the pH and pOH is given by :

pH + pOH = 14

pOH = 14 - pH

$pOH=14-8.46=5.54$

The pOH of the substance is 5.54.

devlian [24]2 years ago

4 0

Answer:B

Explanation:

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What is the wavelength of light emitted when the electron in a hydrogen atom undergoes transition from an energy level with n =

Lady bird [3.3K]

Answer:

$4.86\times10^{-7}\ \text{m}$

Explanation:

R = Rydberg constant = $1.09677583\times 10^7\ \text{m}^{-1}$

$n_1$ = Principal quantum number of an energy level = 2

$n_2$ = Principal quantum number of an energy level for the atomic electron transition = 4

Wavelength is given by the Rydberg formula

$\lambda^{-1}=R\left(\dfrac{1}{n_1^2}-\dfrac{1}{n_2^2}\right)\\\Rightarrow \lambda^{-1}=1.09677583\times 10^7\left(\dfrac{1}{2^2}-\dfrac{1}{4^2}\right)\\\Rightarrow \lambda=\left(1.09677583\times 10^7\left(\dfrac{1}{2^2}-\dfrac{1}{4^2}\right)\right)^{-1}\\\Rightarrow \lambda=4.86\times10^{-7}\ \text{m}$