Mario places 10 mL of water in a test tube and heats the liquid over a Bunsen burner for 2 minutes. After removing the test tube from the Bunsen burner, there are 6 mL of water left in the test tube. This experiment is a good example of a <span>physical change involving phase changes. </span>
Which two solutions, when mixed together, will undergo a double replacement reaction and form a white, solid substance?
1. NaCl(aq) and LiNO3(aq)
2. KCl(aq) and AgNO3(aq) answer
3. KCl(aq) and LiCL(aq)
4. NaNO3(aq) and AgNO3(aq)
2 is the answer because AgCl is formed and that is a white ppt.
Answer:
![H^+(aq)+(ClO)^-(aq)\rightarrow HClO{(aq)}](https://tex.z-dn.net/?f=H%5E%2B%28aq%29%2B%28ClO%29%5E-%28aq%29%5Crightarrow%20HClO%7B%28aq%29%7D)
Explanation:
Hello there!
In this case, since perchloric acid is HClO4 and is a strong acid and calcium hypochlorite is Ca(ClO)2, the undergoing molecular chemical reaction turns out:
![2HClO_4{(aq)}+Ca(ClO)_2{(aq)}\rightarrow 2HClO{(aq)}+Ca(ClO_4)_2{(aq)}](https://tex.z-dn.net/?f=2HClO_4%7B%28aq%29%7D%2BCa%28ClO%29_2%7B%28aq%29%7D%5Crightarrow%202HClO%7B%28aq%29%7D%2BCa%28ClO_4%29_2%7B%28aq%29%7D)
Thus, since the resulting hypochlorous acid is weak, it does not fully ionize, so it remains unionized, however, we can write the ions for the other species:
![2H^++2(ClO_4)^-+Ca^{2+}+2(ClO)^-\rightarrow 2HClO{(aq)}+Ca^{2+}+2(ClO_4)^-](https://tex.z-dn.net/?f=2H%5E%2B%2B2%28ClO_4%29%5E-%2BCa%5E%7B2%2B%7D%2B2%28ClO%29%5E-%5Crightarrow%202HClO%7B%28aq%29%7D%2BCa%5E%7B2%2B%7D%2B2%28ClO_4%29%5E-)
Now, we can cancel out the spectator ions, calcium and perchlorate, to obtain:
![2H^+(aq)+2(ClO)^-(aq)\rightarrow 2HClO{(aq)}\\\\H^+(aq)+(ClO)^-(aq)\rightarrow HClO{(aq)}](https://tex.z-dn.net/?f=2H%5E%2B%28aq%29%2B2%28ClO%29%5E-%28aq%29%5Crightarrow%202HClO%7B%28aq%29%7D%5C%5C%5C%5CH%5E%2B%28aq%29%2B%28ClO%29%5E-%28aq%29%5Crightarrow%20HClO%7B%28aq%29%7D)
Best regards!