1.Alkails turn ___________ litmus paper ___________.
2.The _______________ of a substance indicates the degree of acidity or alkalinity of that substance.
3.Some common weak acids present in our food include ____________ acid in lemons and oranges,___________ acid in vinegar and __________ acid in soft drinks.
4.An acid-alkail indicator can be extracted from _________.
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I.S.填充
2007-05-13 7:52 pm
回答 (1)
2007-05-13 8:04 pm
✔ 最佳答案
1.Alkails turn __red_ litmus paper __blue___.2.The _____pH values____ of a substance indicates the degree of acidity or alkalinity of that substance.
3.Some common weak acids present in our food include ____citric________ acid in lemons and oranges,__ethanoic___ acid in vinegar and ___carbonic_______ acid in soft drinks.
4.An acid-alkail indicator can be extracted from __plants____.
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