Zadanie 26
100 cm3 of each of two solutions are mixed. Which pair of solutions gives a buffer? A. 0.10 mol dm−3 CH3COOH and 0.10 mol dm−3 NaOH B. 0.20 mol dm−3 CH3COOH and…
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100 cm3 of each of two solutions are mixed. Which pair of solutions gives a buffer? A. 0.10 mol dm−3 CH3COOH and 0.10 mol dm−3 NaOH B. 0.20 mol dm−3 CH3COOH and…
Which titration produces the pH curve shown? A. Strong acid added to a strong base B. Weak acid added to a strong base C. Strong base added to a weak acid D. Strong acid added to a weak base
The titration curve shown was recorded with a pH meter. Which type of titration does it represent? A. Weak acid added to a weak base B. Weak base added to a weak acid C. Strong base added to a weak acid D. Strong acid added to a weak base
A 0.010 mol dm−3 solution of a weak acid has Ka = 1.0 × 10−6. What is its pH? A. 2 B. 4 C. 6 D. 8
A weak acid has a concentration of 0.10 mol dm−3 and Ka = 1.0 × 10−7. Which value is closest to the pH of the solution? A. 1 B. 4 C. 7 D. 8
Zinc reacts with an aqueous solution of ethanoic acid. Zn(s) + 2 CH3COOH(aq) → Zn(CH3COO)2(aq) + H2(g) Which combination shows the role of the acid and the gas formed? A. oxidizing agent, H2(g) B. oxidizing agent, CO2(g) C. reducing agent,…
Magnesium ribbon is added to aqueous ethanoic acid. Which combination gives the role of the acid and a product formed from it? A. Oxidizing agent, H2(g) B. Oxidizing agent, CO2(g) C. Reducing agent, H2(g) D. Reducing agent, CO2(g)
What are the products at the electrodes in the electrolysis of 1.0 mol dm−3 aqueous copper(II) sulfate using inert electrodes? A. H2(g) at the cathode and O2(g) at the anode B. Cu(s) at the cathode and SO2(g) at the…
A 1.0 mol dm−3 solution of magnesium chloride is electrolysed between inert electrodes. Which substance forms at the cathode? A. H2(g) B. Mg(s) C. Cl2(g) D. O2(g)
How are the amine and the alcohol shown classified? A. primary amine and primary alcohol B. tertiary amine and secondary alcohol C. primary amine and secondary alcohol D. secondary amine and secondary alcohol