# How will the dielectric constant of water change when ethyl acetate is added?

How will the dielectric constant of water change when ethyl acetate is added?

The $$\mathrm{p}K_a$$ value of weak acids in aprotic solvents will be lower than in protic solvents because the dielectric constant does not favor ionization. If I increase the $$\mathrm{\text{%}}$$ concentration of ethyl acetate in water and gradually increase it to nearly $$\mathrm{100\text{%}}$$ ethyl acetate, how will the $$\mathrm{p}K_a$$ values of a weak acid in this solvent change?

I want to determine the endpoint with an indicator dye and a suitable titrant of a strong base such as sodium hydroxide. My general aim is to calculate pKa in an easier way.

• Note that AcOEt solubily in water is just 8.3g/100ml en.wikipedia.org/wiki/Ethyl_acetate what is less than 2% molar fraction. – Poutnik Jan 27 at 17:55
• ...and note that ethyl acetate will decompose into ethanol and acetic acid in water. – MaxW Jan 27 at 18:50