Calculate [h3o+] given [oh−] in each aqueous solution.
1. [oh−] = 2.1×10^−11 m
express your answer using two significant figures.
2. [oh−] = 6.5×10^−9 m
express your answer using two significant figures.
3. [oh−] = 4.1×10−4 m
express your answer using two significant figures.
4. [oh−] = 5.5×10−2 m
express your answer using two significant figures.