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Soap dissolves in water according to the equation below;
#NaSt(aq) to Na^(+) (aq) + St^(-)# where
#St^(–)# is the stearate ion.
(a) Write the formula of the scum formed when soap is used in hard water.
(b) Write the ionic equation for the reaction that occurs when sodium carbonate is used to remove hardness in water.