Practicals

Question 1

Determining water of crysallisation in hydrated salts and two assumptions to be made

Answer 1

• weigh empty crucible
• add hydrated salt and weigh again
• use pipe clay triangle to support on tripod and heat gently for 1 minute. Heat strongly for 3 minutes
• Leave to cool. Weigh crucible and anhydrous salt.

Formula: calculate mol of anhydrous salt. Calculate mol of water formed. Simplest whole number ratio.

Assumptions: all water lost and no further decomposition