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If it requires 75.0 mL of 0.500M NaOH to neutralize 165.0 mL of an HCI solution, what is the concentration of the HCI solution?
1.0 L buffer solution is prepared by mixing 0.075 M of NH₄Cl, with 0.050 M of NH₃ solution. Calculate the pH when 1.0 mL of 1.0 M of HCl is added to the buffer solution. Assume that the volume of the solution does not change when HCl is added. [Kb for NH₃ = 1.8 x 10⁻⁵]
A 2.0 dm³ container contains 0.15 mol of N₂ gas and 0.20 mol of O₂ gas under a total pressure of 100 kNm⁻². Calculate the partial pressure of O₂ gas in the mixture.
Write T if the statement is true. If the statement is false, underline the word which makes it wrong and write the correct word on the space provided.
__________1. H2 is a polar molecule.
__________2. Water has a trigonal planar molecular geometry.
__________3. Asymmetric covalent compounds are usually nonpolar.
__________4. A molecule in which its central atom has 2 lone pairs and 3 bonding pairs of electrons has a T-shape molecular geometry.
__________5. The central atom in the compound SF6 should be fluorine.
How many sodium atoms are there in one mole of Na atoms?
Assignment- Calculate the molar concentration of HCl (Hydrochloric acid) based on titration
A gas mixture contains 4.0 g of CO(g), 11.0 g of CO₂(g) and 2.0 g of CH4 (g) in a 50.0 - L
vessel. Calculate the partial pressure of each gas in the mixture.
What is the pH of a 0.055 M of HBr solution?
Place not less than 20 Sodium salicylate tablets in a 200ml volumetric flask, add 100ml of water, then allow to stand, with frequent agitation, until the tablets disintegrate completely. Dilute to volume and mix. Filter through a dry filter into a flask, rejecting the subsequent filtrate, equivalent to about 500mg of sodium salicylate, and dilute if necessary, to make about 25ml. Add 75ml of ether and 10 drops of bromophenol blue, and then titrate with 0.1N Hydrochloric acid, mixing the water layer. Draw off the water layer into a small flask, wash the ether once with 5ml of water, add this to the water layer. Add 20ml of ether to the combined water solutions and mix. Continue the titration with vigorous shaking until permanent color is produced in the water layer.
How many moles of magnesium is 3.01 x 1022 atoms of magnesium
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