Suggest reasons why it is necessary to standardise HCl and NaOH solutions​

look at explanation

Explanation:

the actual concentration of the NaOH solution has to be determined experimentally using a process called standardization. To standardize a base solution such as NaOH, an acid whose amount can be determined to a high degree of accuracy (called a primary standard) is needed.

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explanation: it gains negative electrons, therefore becoming negatively charged. as charge cannot be created, nor destroyed, only transferred, this leaves the wool positive. now that they have opposite charges, the two items attract.