2023 WAEC Chemistry Practical Expo
Chemistry Practical Answer
– Formation of a precipitate; Sodium hydroxide reacts with lead nitrate to form lead(ii) hydroxide as a precipitate.
Pb(NO3)2 + 2NaOH –> Pb(OH)2 + 2NaNO3
– Cloudiness or opacity; As the lead(ii) hydroxide precipitate forms, the solution may become cloudy or opaque due to the presence of the solid particles suspended in the liquid
– Formation of precipitate; Iron(iii) Fe(OH)3 is insoluble in water and appears as a reddish brown precipitate.
– Colour change; Colour change form yellowish to reddish brown
– Obtain a small amount of benzoic acid
– Prepare a melting point apparatus
– Fill the capillary tube with the sample of benzoic acid powder
– Insert the capillary tube unit the melting point apparatus
– Begin heating the temperature is increased at a slow rate you allow pressure observation of the melting point
– Observe the melting point
– Repeat the process to ensure accuracy
– Record the melting poin
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