true or false is The dissolving of a solid NOT an indication of a positive test for a particular ion in a solution?
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After a student dissolved 0.5 g of white solid in water, she tested the conductivity and determined that the solution did not conduct electricity. The student then concluded: "when the white solid dissolved it 'just disappeared' so some sort of error must have been made because all solids are ionic compounds and, therefore, are electrolytes. " Comment on the student's conclusion. Is her statement a valid conclusion. If so, identify what is correct. If not, write a conclusion that would be correct.
Adi S.
8. Which of these statements is FALSE? A. Any solid that produces a basic anion will become more soluble at low pH B. Low pH increases solubility for solids that produce basic anions, because the acid reduces the concentration of the basic anion. LeCh"atelier then forces more solid to dissolve, resulting in elevated concentration of the cation. C. For solids that produce basic anions, the concentration of anion is lower than the concentration of the cation at low pH D. For metal hydroxides, solubility decreases at high pH where hydroxide concentration is high E. For solids with non-basic anions like chlorides or bromides, solubility is still higher at low pH. 9. Chromium(II) sulfate has low solubility in neutral water (9.5 mg/L), but dissolves completely in water with a low pH. Which of these explanations are true? 1. At low pH, H+ continuously and irreversibly removes sulfate ion 2. At low pH, OH- continuously removes Cr2+ ion 3. All solids always become completely soluble in acidic solution A. 1 only B. 2 only C. 3 only D. 1 and 3 only E. 2 and 3 only 10. Which of these compounds do not have a pH dependent solubility at less than pH 7.00? A. Cu(OH)2 B. AgBr C. Cr(N3)2 D. Fe(CN)3 E. CaF2
Madhur L.
true or false chem
Ashwin B.
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