Calculate the ph of the solution made by adding 0.50 mol of hobr and 0.30 mol of kobr to 1.00 l of water. the value of ka for hobr is 2.0ă—10â’9. express your answer numerically using two decimal places.

Here we have to get the the of the solution containing HOBr and KOBr.

The of the solution is 8.47

The mixture of HOBr and KOBr is a buffer solution. The of the buffer solution is determined by the Henderson equation which is:

= + log

Here [salt] i.e. KOBr is 0.30 mol/L and [Acid] is 0.50 mol/L.

The value of HOBr is 2×10⁻⁹.

We know, = -log

Or, = -log (2×10⁻⁹)

Or, = 8.698

On plugging the values:

= 8.698 + log

Or, = 8.698 - 0.221

Or, = 8.47

Thus the of the solution is 8.47.

on passing the small ampere of electric current through the tube made of ar and hg of cfl generates uv rays which excites the fluorescent and thus emits the high radiation by consumption of just 5- 12 w in comparison to incandescent light which requires more power such as around 40 - 55 w to lighten.

moreover the life span of fluorescent or cfl is around 8000 h whereas the life span of incandescent is around 1200 h

hence, the building installed with incandescent lights bears more electricity bill.