Question:
how to determine whether the colloid is positive or negative
Answer:
Colloids have charged particles. In order to know whether they are positively or negatively charged, the colloid can be subjected to electrolysis.
If it contains positively charged particles, then these will move towards negative cathode and you will see a precipitate at cathode.
If it contains negatively charged particles, then these will move towards positive anode and you will see a precipitate at anode.
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