I found that in experiments In each group, may be some errors in the process of Titrate. With haidonkhlorik acid 0.1 the whole holiday trends until a PH 8.6. Sometimes it comes down to release the excess haidonkhlorik acid to ph 8.6 excess and titrate. Haidonkhlorik acid by 0.1 ph 8.6 from Larnaca until module 4.0, the same may happen too haidonkhlorik release from ph 4.0.
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