smaller
larger
same
none of the above
reduced at higher pH value of water
unaffected by pH value of water
increased at higher pH value of water
highest at pH value equal to 7
only carbonate hardness is removed
only non-carbonate hardness is re-moved
lime reduces the carbonate hardness and soda-ash removes the non-carbo¬nate hardness
lime reduces the non-carbonate hard-ness and soda-ash removes the carbo¬nate hardness
it is unsuitable for turbid and acidic water
huge amount of precipitate is formed which creates a disposal problem
the effluent cannot be reduced to zero hardness
it is unsuitable for softening the water of excessive hardness
sodium sulphate
copper sulphate
sodium chloride
calcium chloride