A solution has a hydronium concentration of 4.7 × 10-11. What is the pH of the solution?
The pH of the solution is
.

10.3

Explanation:

The pH of a substance is a number spanning from 0 to 14.

A substance with pH between 0 and 7 is said to be acid, while a substance with pH between 7 and 14 is said to be basic. A substance with pH of 7 is a neutral substance.

The pH of a solution can be calculated using the formula:

where

is the concentration of hydronium ion in the solution

In this problem, we have a concentration of hydronium ion in the solution equal to

Therefore, we can apply the formula above to calculate the pH of the solution, and we find:

So, the pH of this solution is 10.3.

The correct answer is - a) red, blue and violet.

Explanation:

In the visible spectrum, the hydrogen atom emits four different wavelengths that are visible to the human eye. The four wavelengths are these lines are 656 nm, 486 nm, 434 and 410 nm. Shorter wavelengths are not visible to human eyes fall in ultravoilet lights at less than 400 nm.

The H-α line is the red color wavelength at 656 nm, the blue color has two different wavelengths that are 486 nm sometimes called cyan, and 434 nm, and violet at 410 nm.