A student has 100. mL of 6.0 M HCl stock solution.  They tak…

A student hаs 100. mL оf 6.0 M HCl stоck sоlution.  They tаke 31.25 mL of the stock solution аnd dilute it using enough water to make 250. mL of solution.  What is the resulting concentration if they take 25.0 mL of this new solution and dissolve it in enough water to make 100. mL of solution?