If a solution of pH 6 is diluted by 100 times, the resulting solution would be

The pH scale is logarithmic, where each whole number change represents a tenfold change in hydrogen ion concentration [H+]. A solution with pH 6 has an [H+] of 10^-6 M. Diluting this solution 100 times reduces the concentration of the solute by a factor of 10^2, theoretically suggesting an [H+] of 10^-8 M. However, in aqueous solutions, the auto-ionization of water always contributes an [H+] of 10^-7 M. When an acid is extremely diluted, the total [H+] concentration approaches but never exceeds 10^-7 M from the acidic side. Therefore, the pH will increase from 6 and approach 7, but it will remain slightly below 7 (approximately 6.96 to 6.99). Since any pH value below 7 is classified as acidic, the resulting solution remains acidic, albeit very weakly so.