"Sigma–Aldrich Calcium Bromide Hydrate 98%" (Article 233749-500G), i.e. 98% CaBr2·xH2O, was used together with deionised water to obtain the targeted stoichiometric concentration of CaBr2·6H2O.
¹at about 25°C (calculated as average of the closest values to 25°C of all provided
measurements)