What is the pH of a solution with a concentration of 4.2 x 10−5 M H3O+? (4 points) Select one:
a. 2.31
b. 4.38
c. 5.62
d. 6.87

What is the pH of a solution with a 4.60 x 10−4 M hydroxide ion concentration? (4 points)

Select one:
a. 0.663
b. 3.33
c. 10.1
d. 10.7

1) b. 4.38

2)  d. 10.7

Explanation:

1) The problem tells us that [H₃O⁺] = 4.2x10⁻⁵ M, and keeping in mind that [H₃O⁺]= [H⁺], we can calculate the pH of the solution:

2) First we calculate the pOH of the solution:

Then we calculate the pH using the following formula:

answer : a model is often used to explain and make things easier to understand when any scientific topic needs to be demonstrated and explained.

as in this case where a scientist wants to use a model to present the results of his detailed scientific investigation. he should do it as it will him to make the audience understand the concept in a much better way. also, it can be changed according to new scientific understandings.

un recipient conține 6,4 moli de gaz. gazul hidrogen reprezintă 25% din totalul kilometrilor din container. în cazul în care presiunea totală este de 1.24 atm ceea ce este