... H2NCH2COO-CH3.Cõu 15. phõn bit cỏc dung dch keo sau õy bng phng phỏp hoỏ hc: nc x phũng, h tinh bt, lũng trngtrng. Hoỏ cht cn dựng theo th t lA. NaOH, HNO3B. Cu(OH)2, HNO3C. I2, Cu(OH)2D. ... H2NCH2COO-CH3.Cõu 22. phõn bit cỏc dung dch keo sau õy bng phng phỏp hoỏ hc: nc x phũng, h tinh bt, lũng trngtrng. Hoỏ cht cn dựng theo th t lA. NaOH, HNO3B. Cu(OH)2, HNO3C. I2, Cu(OH)2D....