core practical 4: rate of hydrolysis of halogenoalkanes

Question 2

method

Answer 2

• add equal volumes of halogenoalkane to 3 diff test tubes (1 chloro, 1 bromo, 1 iodo)
• add equal volumes silver nitrate to each
• place into water bath
• stop clock time for PPT to appear

Question 3

observations of precipitates

Answer 3

AgCl: white ppt
AgBr: cream ppt
AgI: yellow ppt

Question 4

which is fastest

Answer 4

• iodine> bromine> chlorine
• rate of substitution depdnds on strength of c-x bond
• c-I bond weakest as largest atomic radius, furthest distance from nuclei to electorns, weakest electrostatic attraction, least energy to hydrolsyse

Question 5

what is doing the hydrolysis

Answer 5

water