Chapter 4: Q4.45 (page 180)
Do either of the following reactions go to completion? If so, what factor(s) cause(s) each to do so?
Short Answer
Answer
(a)
This reaction goes to completion.
(b)
This reaction goes to completion
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Chapter 4: Q4.45 (page 180)
Do either of the following reactions go to completion? If so, what factor(s) cause(s) each to do so?
Answer
(a)
This reaction goes to completion.
(b)
This reaction goes to completion
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In the process of salting-in, protein solubility in a dilute salt solution is increased by adding more salt. Because the protein solubility depends on the total ion concentration as well as the ion charge, salts yielding doubly charged ions are often more effective than those yielding singly charged ions. (a) How many grams of MgCl2 must dissolve to equal the ion concentration of 12.4 g of NaCl? (b) How many grams of CaS must dissolve? (c) Which of the three salt solutions would dissolve the most protein?
In the process of pickling, rust is removed from newly produced steel by washing the steel in hydrochloric acid:
During the process, some iron is lost as well:
(a) Which reaction, if either, is a redox process? (b) If reaction 2 did not occur and all the HCl were used, how many grams of Fe2O3 could be removed and FeCl3 produced in a 2.50x103-L bath of 3.00 MHCl? (c) If reaction 1 did not occur and all the HCl were used, how many grams of Fe could be lost and FeCl2 produced in a 2.50x103-L bath of 3.00 MHCl? (d) If 0.280 g of Fe is lost per gram of Fe2O3 removed, what is the mass ratio of FeCl2to FeCl3?
Before arc welding was developed, a displacement reaction involving aluminum and iron (III) oxide was commonly used to produce molten iron (the thermite process). This reaction was used, for example, to connect sections of iron railroad track. Calculate the mass of molten iron produced when 1.50 kg of aluminum reacts with 25.0 mol of iron (III) oxide.
Question: State a general equation for a neutralization reaction.
To study a marine organism, a biologist prepares a 1.00-kg sample to simulate the ion concentrations in seawater. She mixes 26.5 g of NaCl, 2.40 g of MgCl2, 3.35 g of MgSO4, 1.20 g of CaCl2, 1.05 g of KCl, 0.315 g of NaHCO3, and 0.098 g of NaBr in distilled water.
(a) If the density of the solution is 1.025 g/cm3, what is the molarity of each ion?
(b) What is the total molarity of alkali metal ions?
(c) What is the total molarity of alkaline earth metal ions?
(d) What is the total molarity of anions?
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