5. What reactions occurs when a solution of hydrochloric acid, HCl, is mixed with a solution of calcium hydroxide, Ca(OH)2?
(A) Cl + Ca(OH) --> HCa + Cl(OH)2
(B) HCl + Ca(OH)2 --> H(OH)2 + CaCl
(C) 2HCl + Ca(OH)2 --> 2H2O + CaCl2
(D) 2HCl + Ca(OH)2 --> H2Ca + 2ClOH
(E) HCl + Ca(OH)2 --> no reaction occurs
6. If the contents of the two beakers shown above (0.1 M of HCl, and 0.1 M of NaOH) are mixed, the resulting solution
(A) will turn red litmus paper blue
(B) will turn blue litmus paper red
(C) will resist large changes in pH
(D) will react with metals
(E) will not change the color of red or blue litmus paper
Please and thank you!
5. E
6. A
To determine the reactions and resulting solution in both scenarios, we need to understand the properties and behavior of the compounds involved.
5. When a solution of hydrochloric acid (HCl) is mixed with a solution of calcium hydroxide (Ca(OH)2), it undergoes a neutralization reaction. The HCl is an acid, while Ca(OH)2 is a base. The general equation for the reaction between an acid and a base is as follows:
Acid + Base → Salt + Water
Given this, we can determine the correct answer by examining the chemical equation options:
(A) Cl + Ca(OH) → HCa + Cl(OH)2: This option does not follow the general equation for acid and base neutralization.
(B) HCl + Ca(OH)2 → H(OH)2 + CaCl: This option does not follow the general equation for acid and base neutralization.
(C) 2HCl + Ca(OH)2 → 2H2O + CaCl2: This equation satisfies the general neutralization reaction equation. It is the balanced chemical equation for the reaction between HCl and Ca(OH)2.
(D) 2HCl + Ca(OH)2 → H2Ca + 2ClOH: This option does not follow the general equation for acid and base neutralization.
(E) HCl + Ca(OH)2 → no reaction occurs: This option is incorrect as it fails to acknowledge the neutralization reaction between the acid and base.
Therefore, the correct answer is (C) 2HCl + Ca(OH)2 → 2H2O + CaCl2.
6. When a 0.1 M solution of HCl and a 0.1 M solution of NaOH are mixed, they form water (H2O) and a salt, sodium chloride (NaCl).
Sodium chloride (NaCl) is a neutral compound, and since the starting solutions are also of equal concentrations, the resulting solution will be neutral as well. Therefore, it will neither turn red litmus paper blue nor blue litmus paper red. It will also not change the color of red or blue litmus paper.
The correct answer is (E) the resulting solution will not change the color of red or blue litmus paper.