![](https://nthumb.tpgimages.com/mid2_com_img/1339/16431/TOP15587853.jpg)
Testing pH. Universal indicator (left) being used to test the pH of a solution (centre) of sodium hydroxide (right). As sodium hydroxide is an alkali, the indicator is purple.
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Details
Creative#:
TOP15587853
Source:
達志影像
Authorization Type:
RM
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須由TPG 完整授權
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No
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No
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No
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