dear sir, can you please elaborate how to standardise edta 0.02N using caco3 solution. as per some articles I took 0.505gm of caco3 and added hcl dil 10ml and made upto 500ml in std flask. then taking 10ml added TEA AND NaOH and p&r indicator added. titrated using prepared edta.using end poinnt burette readings calculated factors for cao mgo and fe2o3