![](https://nthumb.tpgimages.com/mid2_com_img/1339/7975/TOP10163998.jpg)
Blackcurrant juice indicator in an acidic solution (image 1 of 2). Changes in colour (here from purple, the colour of the juice, to red) are a common way to test the pH of a solution. Alkali and acid are the two parts of the pH scale, indicating the hydrogen ion concentration in a solution relative to that found in water. Alkalis (pH 8-14) contain fewer free hydrogen ions than water, while acids (pH 1-6) contain more. Water (pH 7) is considered neutral. See A500/521 for blackcurrant juice in an alkali solution.
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Creative#:
TOP10163998
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達志影像
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RM
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