Question

Name Date CONSIDER THIS 1. Look up in your text or the CRC Handbook of Chemistry and Physics the first two ionization energies for the elements calcium and zinc. Record them below. Based on the values of the ionization energies, which metal would you expect to be the most active, calcium or zinc? IE(1) Са 590 ks / hes 1145*J/ma Zn 906.40 /mol 1733.30 45 mer IE(2) 2. Complete and balance the following sequence of chemical reactions that takes place when the calcium reacts with water and when the calcium reaction products are titrated with HCl solution: Ca(s) + H20 - Ca(OH)2 + HCI- The two reactions may be combined (added together) to get the net chemical reaction that shows the initial reactants and the final reaction products after the titration is completed. Write the net chemical reaction: 3. If some of the calcium metal remains unreacted when the titration is begun, the following reaction would occur as HCl is added: Ca(s) + 2HCl(aq) - CaCl(aq) + H2(g) Would this cause an error in the titration? If so, would more or less HCl be required?

Answer 1

from that zn. than the lonisation value it is evidenta the If1 + LE2 both are high for So to ionise in more energy is require Ca. 5o Ca is more active. - Ca (3)+2420 Calo H)₂ + 2HU Ca (OH)₂ + H₂9 - Calle + 2H2O Met - reaction Ca (6) et 24U Call & lt Yes if Ca (B) is remained excess. this side reaction will happen and more He is required. Please gere like.