Pre-LabQ 5: The pure substances below are added to water. First, use TABLE 1 to
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Pre-LabQ 5: The pure substances below are added to water. First, use TABLE 1 to tell whether each of the substances are soluble, slightly soluble or insoluble. If the 1. Use TABLES 2 and 3 to tell whether it is a strong/weak acid or a strong/weak 2. Show how the substance exists in water by write formulas for the dissolved substance is soluble, do the following: base. species. For example, HaPO,) is soluble in water. It is a weak acid and exists as molecules in water, HyPO(aq). Another example is Sr(OH)(s), which is also soluble in water. It is a strong base and exists in water as ions, Sr (aq) 20H(aq). (a) Ca(OH) (s) (b) HF Pre-LabQ 6: On a field trip in your geology class, you find a rock that may be limestone, Caco,. To test your hunch, you pour a dilute solution of hydrochloric acid from your test kit over sample of the rock and notice that it dissolves with the evolution of bubbles Write ME, TIE and NIE for the reaction.Explanation / Answer
5) a) Ca(OH)2: In the table 1, we can see that all the salts containing hydroxides are insoluble. But Ca(OH)2 is slightly soluble. In table 3, it is mentioned that Ca(OH)2 is insoluble base, so it is a weak base.
The reaction of Ca(OH)2 in water is:
Ca(OH)2 (s) -----> Ca(OH)2 (aq)
As it is slightly soluble, so it will remain in aqueous phase and not dissociate into ions in water.
b) HF (l) : In table 1, it is mentioned that salts containing F- ions is insoluble. So, HF (l) is insoluble. In table 2, it is mentioned that HF is weak acid. So, it will also not dissociate in water. The reaction is:
HF (l) ----> HF (l)
It will remain in liquid phase, as it is insoluble.
6) Reaction of CaCO3 (s) with HCl(aq) is:
Molecular equation:
CaCO3(s) + 2HCl(aq) -----> CaCl2(aq) + CO2(g) + H2O(l)
Total Ionic equation:
CaCO3(s) + 2H+(aq) + 2Cl-(aq) -----> Ca2+(aq) + 2Cl-(aq) + CO2(g) + H2O(l)
Net ionic equation:
CaCO3(s) + 2H+(aq) -----> Ca2+(aq) + CO2(g) + H2O(l)
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