The ionization constant of water at a certain temperature above 25°C is 3.30 × 10^-14. What is the pH of pure water at this temperature?

Provide your answer to 2 decimal places.

Die ionisasie konstante van water by 'n sekere temperatuur bo 25°C is 3.30 × 10^-14. Wat is die pH van suiwer water by hierdie temperatuur?

Gee jou antwoord met 2 desimale plekke.

A solution of sulfuric acid (H₂SO₄, 25.00 mL) was titrated to the second equivalence point with 34.55 mL of 0.1020 M sodium hydroxide.

What was the concentration of the sulfuric acid? (Please provide your answer to 4 significant figures.)

'n Oplossing van swaelsuur (H₂SO₄, 25.00 mL) is tot die tweede ekwivalensiepunt getitreer met 34.55 mL 0.1020 M natriumhidroksied.

Wat was die konsentrasie van die swaelsuur? (Gee asseblief jou antwoord tot 4 beduidende syfers.)

What mass of NaOH(s) is required to prepare 2.00 litres of an aqueous solution with a pH of 13.57?

Please provide your answer to 3 significant figures.

Watter massa NaOH(s) word benodig om 'n 2.00 liter van 'n waterige oplossing met 'n pH van 13.57 voor te berei? 

Gee asb jou antwoord tot 3 beduidende syfers.

Consider the reaction below, where K = 170 at 298 K. 

At a certain time, 0.015 M NO₂(g) and 0.025 M N₂O₄(g) are present.

Determine if the reaction is at equilibrium or not. If not, explain briefly which way must the reaction proceed to reach equilibrium. Do any necessary calculations and report any relevant values as part of your explanation.

Beskou die reaksie hieronder, waar K = 170 by 298 K.

Op 'n sekere tyd is 0.015 M NO₂(g) en 0.025 M N₂O₄(g) teenwoordig.

Bepaal of die reaksie by ewewig is of nie. Indien nie, verduidelik kortliks na watter kant moet die reaksie voortgaan om ewewig te bereik. Doen enige relevante berekeninge en rapporteer enige nodige waardes as deel van jou verduideliking.

If K_c = 65.0 for the reaction 4NOCl 

Provide your answer to 3 significant figures.

As K_c = 65.0 vir die reaksie 4NOCl 

Gee jou antwoord met 3 beduidende syfers.

A mixture of nitrogen and hydrogen was allowed to come to equilibrium at a given temperature according to the reaction equation below. 

An analysis of the mixture at equilibrium revealed 2.1 mol N₂, 2.8 mol H₂ and 1.8 mol NH₃ in a 1.5 L container. How many moles of H₂ were present at the beginning of the reaction?

Please provide your answer with 2 significant figures.

'n Mengsel van stikstof en waterstof word toegelaat om teen 'n gegewe temperatuur tot ewewig te kom volgens die reaksievergelyking hieronder. 

'n Analise van die mengsel by ewewig toon 2.1 mol N₂, 2.8 mol H₂ en 1.8 mol NH₃ in 'n 1.5 L houer. Hoeveel mol H₂ was aan die begin van die reaksie teenwoordig? 

Gee asb jou antwoord met 2 beduidende syfers.

In an experiment, 0.20 mol Br₂ and 0.20 mol Cl₂ are mixed in a 1.00 L container, and the reaction forms BrCl. If K = 6.25 for this reaction, what is the equilibrium concentration (in mol/L) of BrCl? (Please provide your answer with 2 significant figures.)

In 'n eksperiment word 0.20 mol Br₂ en 0.20 mol Cl₂ in 'n 1.00 L houer gemeng, en die reaksie vorm BrCl. As K = 6.25 vir hierdie reaksie, wat is die ewewigskonsentrasie (in mol/L) van BrCl? (Gee asb jou antwoord met 2 beduidende syfers.)

The following question will test your ability to see resonance structures in the most extreme way! Just note that this is actually not a normal question level for this course, but rather to see if you are a resonance ninja. It comes from a recent research talk we had. The reaction is the start of a dehydration reaction, which you will cover later, where the 3° alcohol is ripped off by the acid leaving a carbocation as shown. 

Now for the question - how many possible resonance intermediates are there for this carbocation?

A saturated solution of lead(II) hydroxide (Pb(OH)2) has a pH of 12.55 at 298 K. Calculate Ksp for Pb(OH)2 at this temperature.

'n Versadigde oplossing van lood(II) hidroksied (Pb(OH)2) het 'n pH van 12.55 by 298 K. Bereken Ksp vir Pb(OH)2 by hierdie temperatuur.

How many grams of PbI2 (Ksp = 9.8 x 10-9) can dissolve in 1.00 L of water at 298 K? (Mr of PbI2 = 461 g/mol)

Hoeveel gram PbI2 (Ksp = 9.8 x 10-9) kan in 1.00 L water by 298 K oplos? (Mr van PbI2 = 461 g/mol)