7) Ca + 2H2O ----> Ca(OH)2 + H2
0.1 g Ca = 0.1g /40 g/mol = 0.0025 mole
So [OH-] = 2* 0.0025 moles / 0.500 L = 0.01 M
8) 0.1 M ZnCl2 contains 2*0.1 M (0.2 M)of Cl- ions
0.2 M = 0.2 mole / 1 L so in 1.75 L it will have 0.375 moles of Cl- ion
4 For the reaction: Ca+H_2O rightarrow Ca(OH)_2 +H_2 First, balance the equations. WhAt is the final...
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4 Answer the following questions about a 1.50 M HCl solution: a. What is the new molarity if exactly 200 mL of the solution is diluted to 1.000 L? b. How many mls of the solution must be diluted to exactly 500 mL to form a 0.100 M HCl solution? C. How many moles of HCl are present in a diluted solution if exactly 100 mL of the original solution are diluted to 2.000 L? 5. Identify the acid and...