## Programming Problem

Chemists, biologists, and biochemists, are often interested in calculating the pH level of a given solution. A solution with a pH level less than 7 is acidic; otherwise, it is basic. Determining the pH of a solution is important, since many organisms and micro-organisms can only live in a limited pH range.

• Write a C++ program that calculates and prints the pH level, and states whether the solution is acidic or basic.
• The input is concentration of hydroxide ions, denoted , and is a real number.
• The concentration of hydronium ions, abbreviated , is calculated by the formula

• The pH level can then be computed with

• For example, if the input solution is 0.002, your program should print something like this:
```The pH level of solution 0.002 is 11.30103. The solution is basic.
```
• Use proper loop structure, meaningful variable names, proper indentation, and appropriate comments.
• Use the format and style described in the assignment guidelines.
• Here are four hydroxide concentrations to use as test input :

0.002
0.00006
0.000000007
0.0000000009

### Sample Output

```This program calculates ph level
Enter 0 to quit the program.
Please input the concentration of hydroxide: 0.002
The ph level of solution 0.0020000000 is 11.3010299957. The solution is basic.

Please input the concentration of hydroxide: 0.00006
The ph level of solution 0.0000600000 is 9.7781512504. The solution is basic.

Please input the concentration of hydroxide: 0.000000007
The ph level of solution 0.0000000070 is 5.8450980400. The solution is acidic.

Please input the concentration of hydroxide: 0.0000000009
The ph level of solution 0.0000000009 is 4.9542425094. The solution is acidic.

Please input the concentration of hydroxide: 0
You entered 0, so quit the program.
```