Zadanie 27
What is the ratio of [H+] in an aqueous solution of ammonia with pH = 10 to [H+] in pure water at 298 K? A. 10 : 7 B. 7 : 10 C. 1 : 103 D. 103 : 1
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What is the ratio of [H+] in an aqueous solution of ammonia with pH = 10 to [H+] in pure water at 298 K? A. 10 : 7 B. 7 : 10 C. 1 : 103 D. 103 : 1
In which pair of species does nitrogen have the same oxidation state? A. HNO2 and N2O3 B. NO3− and N2O4 C. NH4+ and N2H4 D. NO and N2O
What is the conjugate base of H2PO4−? A. H3PO4 B. HPO42− C. PO43− D. H3O+
Which statement is correct for a voltaic cell made from a zinc half-cell and a copper half-cell? The standard electrode potential of the zinc half-cell is more negative than that of the copper half-cell. A. Zinc is the cathode. B. Electrons flow through the…
Which combination is correct for a strong acid and its conjugate base? A. The pKa of the acid is low and the Kb of the conjugate base is low B. The pKa of the acid is low and the Kb of the…
What are the products of the electrolysis of dilute aqueous copper(II) sulfate, CuSO4(aq), using inert electrodes? A. hydrogen gas and oxygen gas B. copper metal and oxygen gas C. hydrogen gas and sulfur dioxide gas D. copper metal and sulfur dioxide…
The pH curve below is produced when 25.0 cm3 of ethanoic acid of concentration 0.100 mol dm−3 is titrated with sodium hydroxide solution of concentration 0.100 mol dm−3. Besides water and sodium ions, which species…
Zinc lies above nickel in the reactivity series. A voltaic cell is made from a zinc electrode in Zn2+(aq) and a nickel electrode in Ni2+(aq). The electrodes are connected by a wire with a voltmeter, and the two solutions are connected by a salt…
Which compounds belong to the same homologous series? A. CH3CH2COOH, CH3COOH, CH3CH2CH2COOH B. CH3COCH3, CH3CH2CHO, CH3CH2COCH3 C. CH3CH2OH, CH3CHO, CH3COOH D. CH3CH2Cl, CH2=CHCl,…
The concentration of hypochlorite ions in bleach can be determined in two stages. Stage I: ClO−(aq) + 2 I−(aq) + 2 H+(aq) → Cl−(aq) + I2(aq) + H2O(l) Stage II: I2(aq) + 2 S2O32−(aq) → 2 I−(aq) + S4O62−(aq) Which of the following is correct? A.…