Which of the following solutions is a good buffer system? A solution that is 0.1

Question

Which of the following solutions is a good buffer system? A solution that is 0.10 M NaCl and 0.10 M HCl A solution that is 0.10 M HCN and 0.10 M LiCN A solution that is 0.10 M NaOH and 0.10 M HNO_3 A solution that is 0.10 M HNO_3 and 0.10 M NaNO_3 A solution that is 0.10 M HCN and 0.10 M KI How many milliliters of 0.0850 M NaOH are required to titrate 25.0 mL of 0.0720 M HBr to the equivalence point? 21.2 0.245 3.92 0.153 29.5 The___Law of Thermodynamics states that for any spontaneous reaction, the entropy of the universe increases. Zero First Second Third Fourth Identify the process that is spontaneous rusting of iron electrolysis photosynthesis burning gasoline Consider a reaction that has a positive Delta H and a positive Delta S. Which of the following statements is TRUR? This reaction will be spontaneous only at high temperatures. This reaction will be spontaneous at all temperatures. This reaction will be nonspontaneous at all temperatures. This reaction will be nonspontaneous only at high temperatures. It is not possible to determine without more information. For the following example, identify the following. H_2O(I) rightarrow H_2O(g) a negative Delta H and a negative Delta S a positive Delta H and a negative Delta S a negative Delta H and a positive Delta S a positive Delta H and a positive Delta S It is not possible to determine without more information.

Explanation / Answer

11.

Acid buffer solution: The mixture of weak acid and it's salt with strong base is called acid buffer solution.

                               B. A solution that is 0.1 M HCN and 0.1 M LiCN

12. NaOH + HBr ------> NaBr + H2O

    1 mole    1 mole

NaOH                                                                    HBr

M1 = 0.085M                                                       M2 = 0.072M

V1 =                                                                  V2 = 25ml

n1   = 1                                                               n2 = 1

M1V1/n1              =            M2V2/n2

V1                      =           M2V2n1/n2M1

                         =            0.072*25*1/1*0.085   = 21.176ml = 21.2ml

A) 21.2ml

13. C) secons

Second law of thermodynamic : The entropy of the universe is increases

14. C) photosynthesis

15. A)

16. C)

heat energy is release . So it is exothermic deltaH is negative

Disorder is increases entropy is increases.

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