The number of dilutions needed to be made before getting to 2.5 % as the final concentration would be 2.
We are given that, we have to do 50% serial dilution, which means that after every dilution the concentration reduces to half of its initial value.
On starting with 10% concentration, the concentration after one dilution would be 5%.
After diluting it two times, the final concentration would be half of 5% i.e 2.5%.
Thus, the number of dilutions needed to be made before getting to 2.5 % as the final concentration would be 2.
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