1. fill the solution haidonkhlorik acid (acid salts), lots of small drops of 20 in vitro pH monitoring.Acid salt in aqueous solution by the paper's University Sullivan the di a saved result applications.
1. Fill the solution of hydrochloric acid (hydrochloric acid) Dilute 20 drops in a small test tube monitor pH of a solution of hydrochloric acid. Paper Universal In-enabling the recording.
1. Add hydrochloric dilute hydrochloric acid) (20 drops in vitro small check pH of ารละลาย hydrochloric acid with paper universal indicator. Save results .