Method for producing chemically strengthened glass

A method for producing a chemically strengthened glass, comprising:

• bringing a glass comprising sodium into contact with an inorganic salt comprising potassium nitrate, thereby performing ion exchange of a Na ion in the glass with a K ion in the inorganic salt;
• washing the glass after the ion exchange;
• bringing the glass into contact with an acid after the washing such that a low-density layer is formed in a surface portion of the glass;
• and
• bringing the glass into contact with an alkali after contacting the acid such that at least part of the low-density layer is removed,
• wherein the inorganic salt comprises at least one salt selected from the group consisting of K2CO3, Na2CO3, KHCO3, NaHCO3, K3PO4, Na3PO4, K2SO4, Na2SO4, KOH and NaOH.