## MYTUTOR SUBJECT ANSWERS

613 views

### Calculate the pH of a 4.00 x 10^-2 mol dm^-3 solution of Ba(OH)2

The easiest way to answer this question is by using the equation pH + pOH = 14.

Firstly, we need to work out the number of moles of OH- in the solution. As the formula for Ba(OH)2  shows that it has 2 moles of OH- for every 1 mole of Ba+ , the number of moles of OH- ions will be equal to twice the concentration of the solution.

Therefore, there are 8.00 x 10-12 moles of OH- ions in the solution.

As pOH= -log (OH-), pOH = -log (8.00 x 10-12

Therefore pOH= 1.097

By rearranging the formula pH + pOH = 14, we get 14-pOH= pH

Therefore, 14-1.097= 12.9

The pH of the solution is 12.9

1 year ago

Answered by Chloe, who has applied to tutor IB Chemistry with MyTutor

## Still stuck? Get one-to-one help from a personally interviewed subject specialist

#### 23 SUBJECT SPECIALISTS

£26 /hr

Degree: Medicine (Other) - Edinburgh University

Subjects offered:Chemistry, Physics+ 5 more

Chemistry
Physics
Dutch
Biology
.UKCAT.
-Personal Statements-
-Medical School Preparation-

“Hi! I am Anna and I study Medicine. I have done the IB (new syllabus) so I know all about the new curriculum, including IAs and Exams!”

£20 /hr

Degree: Medicine (Bachelors) - Imperial College London University

Subjects offered:Chemistry, Maths+ 7 more

Chemistry
Maths
Human Biology
Arabic
.UKCAT.
-Personal Statements-
-Medical School Preparation-

“Imperial College Medical Student with more than 3 years experience tutoring Sciences up to A-level, entrance exams and interview practice”

MyTutor guarantee

|  2 completed tutorials

£20 /hr

Degree: Natural Sciences (Bachelors) - Cambridge University

Subjects offered:Chemistry, Maths+ 2 more

Chemistry
Maths
Biology
-Medical School Preparation-

“I would like to share my passion for science and help you discover the key patterns which govern our world.”

#### About the author

£20 /hr

Degree: Chemistry (Bachelors) - St. Andrews University

Subjects offered:Chemistry, Mandarin+ 3 more

Chemistry
Mandarin
Geography
English and World Literature
Biology

“About me Hi! I am an undergraduate Chemistry student at the University of St. Andrews. I love sciences and my main goal would be to hopefully get you interested in Biology or Chemistry as well as to achieve a great mark in your exams...”

MyTutor guarantee

### You may also like...

#### Posts by Chloe

Calculate the pH of a 4.00 x 10^-2 mol dm^-3 solution of Ba(OH)2

Explain why average bond enthalpies can be used for cyclohexane but not for benzene

#### Other IB Chemistry questions

In order for a chemical reaction to occur the particles must...

What factors affect the rate of a reaction?

What is the effect of temperature on the rate of a reaction?

Explain why average bond enthalpies can be used for cyclohexane but not for benzene

We use cookies to improve your site experience. By continuing to use this website, we'll assume that you're OK with this.