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Acid HA has a Ka of 2.00 x 10-4mol dm-3. A solution was made by adding 15cm3 of 0.34 M NaOH to 25cm3 of 0.45M HA. Calculate the moles and the concentration of A- and HA in this solution. Using the expression for Ka calculate the pH of the solution

Write the equation: NaOH + HA --> NaA + H2O. Find the moles of A-: the moles of A-= the moles of NaO...

HS
Answered by Hibba S. • Chemistry tutor
7003 Views

How do I even start going about learning the verb conjugations when there are so many different moods, tenses and endings?

When I was tutoring GCSE students at my school, this was often the first question I was asked. To a GCSE student, the prospect of learning a vast array of conjugation tables seems daunting and verbs tend ...

DC
Answered by Daniel C. • French tutor
2174 Views

How would you calculate the vertical and horizontal components of the velocity of an object with an initial velocity of 15m/s which is travelling upwards at an angle of 30 degrees to the horizontal?

With these sort of questions involving components, I would always advise drawing a diagram of the problem so that you're clear of the situation!In this case we have an object that is travelling at a speed...

JP
Answered by Joseph P. • Physics tutor
6688 Views

If a train leaves for a 130 mile journey at 1.30pm, and travels at a constant speed of 50 miles per hour, at what time will it arrive?

First, calculate the time taken for the train to complete its journey:
Distance = 130, Speed = 50, Time = Distance/Speed = 130/50 = 2.6 hours.
Next, use this to calculate the time of arrival:

LD
Answered by Luke D. • Maths tutor
5184 Views

An excess of Lead (II) oxide reacts with 175cm3 of 1.5 mol dm3 nitric acid. Calculate the maximum quantity of lead that can be obtained from this reaction.

Write the equation: PbO + HNO3 --> PbNO3 + H2O. Balance the equation: there are two moles of hydrogen (in water) on the right. To bala...

HS
Answered by Hibba S. • Chemistry tutor
9333 Views

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