Question 5 Wot yet answered If the K, of a weak base is 0.0000000013, what is...
CII 12 UCIICIUL CUCITSUI Y II- CIT 12/TU Question 3 Not yet answered A 0.15 M solution of an unknown monoprotic acid has a pH of 4.57, calculate the K for this unknown acid. You should have two significant figures in your answer and your answer should be in the following format (i.e. 1.0e-3). Marked out of 0.50 Answer: Flag question Question 4 Not yet answered An aqueous solution is made of the diprotic acid H.A to a concentration of...
Question 1 In the Lewis acid-base definition, an acid is a/an... Not yet answered Select one: Marked out of cause of a lower pH 1.00 source of H P Flag question lone pair acceptor proton donor Question 2 During a Lewis acid-base reaction, the Lewis base usually Not yet answered Select one: Marked out of gains a formal charge 1.00 gains a lone pair Flag question becomes an ion loses a lone pair Question 3 Which of the following is...
Question 39 1 pts A weak acid (HA) reacts with a weak base (B) to form the conjugate base of the acid (A) and the conjugate acid of the base (B-H the pKa of HA was 4.8 and the pKa of BH* (i.e., the pKabH of B) was 9.4, what would be the value of the equilibrium constant for the above reaction to the nearest ones? Obviously, by expressing the answer to the nearest ones, we are using too many...
1a. A weak monoprotic base has a Kb = 1.67 × 10−10. Calculate the Ka for the conjugate acid of this base. Report your answer to THREE significant figures. You may (but are not required to) enter your answer in scientific notation; for example, if your answer is 2.44 × 10-2, you would enter 2.44E-2. The E must be uppercase. 1b. A weak monoprotic base has a Kb = 3.38 × 10−3. Calculate the Ka for the conjugate acid of...
Question 1 Not yet answered Marked out of 1.00 The area of the plane figure bounded by the curve y:23 and the Ox axis (y20)is equal to k.π. Find k. Answer ? Flag question Question2 Not yet answered The area of the plane figure bounded by one leaf of the curve ?'-9 cos3p is equal to k-T. Find k Marked out of Answe: 1.00 P Flag question Question 1 Not yet answered Marked out of 1.00 The area of the...
part 1 A weak monoprotic base has a Kb = 2.43 × 10−10. Calculate the Ka for the conjugate acid of this base. Report your answer to THREE significant figures. You may (but are not required to) enter your answer in scientific notation; for example, if your answer is 2.44 × 10-2, you would enter 2.44E-2. The E must be uppercase. part 2 A weak monoprotic base has a Kb = 3.71 × 10−9. Calculate the Ka for the conjugate...
Question 17 Not yet answered Calculate the increase of entropy (in J/K) when 73 g of ice melts at 0 °C and 1 atm. (The heat of fusion for ice is 6,000 J/mol.) Marked out of 1.00 Answer: P Flag question Calculate the change in entropy (in J/K) when 98.2 g of water is heated from 28.7 °C to 76.7 °C at 1 atm. (The specific heat is 4.184 J/(g-K).) Question 18 Not yet answered Marked out of 1.00 Notice...
Question 1 Not yet answered Marked out of 1.00 Flag question Solve the following pair of simultaneous equations. -3.- 5y = -13, 5x + 4y = 26. Give your answers exactly, as integers or single fractions. The solution is: x = y= Question 2 Not yet answered Marked out of 1.00 Flag question Suppose that the number of atoms of a particular isotope at time t (in hours) is given by the exponential decay function f(t) = -0.578. By what...
Question 4 In redox titration you are often working from the... Not yet answered Marked out of 1.00 P Flag question Select one: O Net ionic equation O Empirical formula O Half equatuin • Unbalanced equation Why is titration a standard practice in chemistry? Question 5 Not yet answered Marked out of 1.00 Select one: o It uses the greatest amount of solvent o It can be used to obtain a concentration to a large number of significant figures P...
Calculate the Kb of the conjugate base of a weak acid with a Ka = 5.28 × 10−5. - report answer in three significant figures - answer should be written in scientific notation (ex. 4.67E-7 or 4.67E7 be sure to use a CAPITAL E not lower case 'e')