documentclass{article}
usepackage{amsmath}
usepackage{siunitx}
usepackage[version=4]{mhchem}

sisetup{output-decimal-marker={,}}

begin{document}

[
SI{30}{milliliter},mathrm{dis.}cdot
frac{SI{0,1}{mol},ce{NaOH}}{SI{e3}{milliliter},mathrm{dis.}}cdot
frac{SI{1}{mol},ce{HftK}}{SI{1}{mol},ce{NaOH}}cdot
frac{SI{203,23}{mol},ce{HftK}}{SI{1}{mol},ce{HftK}}=
SI{0,61269}{gram},ce{HftK}
]

end{document}