TY - GEN AU - Milla González, Miguel A4 - Química Analítica PY - 2011 UR - http://hdl.handle.net/10498/14127 AB - Water hardness is due to the presence of multivalent metal ions. In natural waters, the most abundant ions are calcium(II) and, in less amount, magnesium(II). Cations such as Fe(III), Al(III), Mn(II) and other metal ions also contribute to hardness,... LA - eng KW - water analysis KW - water hardness KW - Ca and Mg in natural waters KW - complexometry KW - complexometric titration KW - EDTA KW - water hardness by complexometry KW - water hardness assay KW - eriochrome black T KW - interactive lab experiment KW - simulated determination of water hardness TI - Complexometric assay for water hardness: an interactive lab experiment. ER -