A ‘breath test’ used by traffic police to check drunken driving uses ____?

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Solution

A 'breath test' used by traffic police to check drunken driving uses Potassium dichromatic-sulphuric acid

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Q. The traffic police said to the driver, “Do not use your phone while driving.”

[0.8 mark]

Every year in our country about

25, 000

people are dead and

5, 00, 000

more are injured as a result of drunk driving. In spite of efforts to educate the public about the dangers of driving while intoxicated and stiffer penalties for drunk driving offences, law enforcement agencies still have to devote a great deal of work to remove drunk drivers from roads.

The police often use a device called a breath analyser to test drivers suspected of being drunk. The chemical basis of this device is a redox reaction. A sample of the driver's breath is drawn into the breath analyser, where it is treated with an acidic solution of potassium dichromate.

3 C H_{3} C H_{2} O H + 2 K_{2} C r_{2} O_{7} + 8 H_{2} S O_{4} \to

3 C H_{3} C O O H + 2 C r_{2} (S O_{4})_{3} + 2 K_{2} S O_{4} + 11 H_{2} O

The driver's blood-alcohol level can be determined readily by measuring the degree of this colour change (read from a calibrated meter on the instrument). The current legal limit of blood alcohol content is

0.1

percentage by mass. Anything higher constitutes intoxication.

The alcohol content in a

10.0

g sample of blood from a driver required

4.23

mL of

0.07654 M K_{2} C r_{2} O_{7}

for titration. Should the police prosecute the individual for drunken driving?

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