Calcium (z=20) loses electrons successively to form `Ca^+,Ca^(2+) and Ca^(3+) ions`. Which step have highest ionization enthalpy?

Find number of electron in Ca2+

Electronic configuration of Ca^2+ .........

CaS exists in a cubic close packed arrangement of S^(2-) ions in which Ca^(2+) ions occupy 1/2 of the available tetrahedral holes. How many Ca^(2+)and S^(2-) ions are contained in the unit cell?

Balance the chemical equation : HNO3 + Ca(OH)2 → Ca(NO3)2 + H2O

The well known mineral fluorite is chemically clacium fluoride. Its is known that in one unit cell of this mineral there are 4 Ca^(2+) ions and 8 F^- ions and that of Ca^(2+) ions are arranged in a fcc lattice. The F^- ions fill all the tetrahedral holes in the face centred cubic lattice of Ca^(2+) ions. the edge of hte unit cell is 5.46xx10^-8 cm in length. the density of the solid is 3.18 gcm^-3 . use this information to calculate the Avagadro's number. (Molar mass of CaF_2=70.08 g mol^-1 ).

1L of pond water contains 20mg of Ca^(2+) and 12mg of mg^(2+) ions. What is the volume of a 2N Na_2 CO_3 solution required to soften 5000L of pond water ?

If limiting molar conductivity of Ca^(2+) and Cl^(-) are 119.0 and 76.3 S cm^2 mol^(-1) , then the value of limiting molar conductivity of CaCl_2 will be :