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- Which of the following is an amphoteric species? Select one: a. LiOH b. None of these c. HSO4- d. HClO4 e. HCO3- Clear my choice What is the value of Kw for water at 25oC? Select one: a. 2.0 x 10-7 b. 14 c. 1.0 x 10-14 d. 2.0 x 10-14 e. 1.0 x 10-7 f. 7Write the equation which has Keq = [AB2]2/[A2][B2]2#6 only! TYIA.
- (please see pictures attached for reference. I tried my best) 27. Dissolved dioxygen in water samples can be determined by the following equations:2MnSO4(aq) + 4NaOH(aq) + O2(g) --> 2MnO2(s) + 2Na2SO4(aq) + 2H2O(l)2MnO2(s) + 2H2SO4(aq) + 2NaI(aq) -->MnSO4(aq) + I2(aq) + Na2SO4(aq) + 2H2O(l)I2(aq) + 2Na2S2O3(aq) --> Na2S4O6(aq) + 2NaI(aq)A water sample from the local river was treated according to the first two equations above. Exactly 200.00 mL ofthis treated water required 8.32 mL of 0.0250 M Na2S2O3 to titrate to the endpoint. Calculate the concentration ofdissolved oxygen in the water sample.A) 1.04 x 10-3MB) 2.08 x 10-4MC) 5.20 x 10-4MD) 8.67 x 10-7ME) 4.33 x 10-7M 28) How many neutrons are needed to initiate the fission reaction shown? 23592 U + ? 10 n --> 13956 Ba +9436 Kr+ 310n a) 0 b) 1 c) 2 d) 3 e) 5 20. Consider the substances H2O, KI, H2S, CH4. Which answer has the substances arranged in order ofDECREASING boiling point?a) KI > H2O > CH4 > H2S b) KI…The value of Kw at 50°C is 5.48 × 10−14. Calculate the OH− concentration from the above solution at 50°C.Calculate [H+][H+] for [OH−]=4.0×10−4 M[OH−]=4.0×10−4 M. Express your answer using two significant figures. [H+]= M
- How much mL of BaSO4 will be recovered given the following: Solution A: Na2SO4(aq) = 0.01 M; V = 100 mL Solution B: BaCl2(aq) = 0.1 M; V = 50 mLWhich of the following does not have DHof=0 at 25oC? N2(g) Cu(s) Kr(g) Hg(s) H2(g) I2(S)the question states that the Ka value was 3.0 x 10-8 but in step two to calculate the value of pKa you calculated using the -log of 30.0 x 10-8 why did you use that number instead?