Calculate the residence time of strontium (Sr2+) in the world ocean, given that the average concentration of strontium in the world’s rivers is approximately 0.87 µmol L-1 (5 pts).
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Calculate the residence time of strontium (Sr2+) in the world ocean, given that the average concentration of strontium in the world’s rivers is approximately 0.87 µmol L-1 (5 pts).
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- To further investigate the reactivity of silver, the student submerges a piece of metallic scandium, Sc (s), in a solution of AgNO3 (aq) and observes that the following reaction occurs. Sc(s) + 3 AGNO3 (ag) →3 Ag(s) + Sc(NO3); (aq) (k) Write the balanced net-ionic equation for the reaction. B IU x² X, 3 Ĉ Ω 0/10000 Word LimitCalculate the fraction of intact H2PO3 molecules in an aqueous solution of phosphorous acid at (a) pH = 5.0 and (b) pH =9.0.7. A technician is setting up a laboratory to standardise ~0.0200 mol dm–3 KMnO4. What mass of Mohr’s salt [FeSO4(NH4)2SO4·6H2O] would the technician be required to weigh out to produce a 5.00 L solution of Mohr’s salt such that 25.0 cm3 aliquots of the salt would require a titre of 20.0 cm3 to standardise the KMnO4 solution?
- Consider the photochemical isomerization A= B. At 650. nm, the quantum yields for the forward and reverse reactions are 0.83 and 0.52, respectively. If the molar absorptivities at 650. nm of A andB are 1.2×103 L·mol-1.cm¬1 and 4.5x102 L·mol-1.cm-1, respectively, what is the ratio [B]/[A] in the photostationary state? [B] = 4.0 [A] Supporting Materials Periodic Table E Constants and I Supplemental Data FactorsThe reaction of calcium hydride, CaH2, with water can be characterized as a Lewis acid-base reaction:CaH2(s) + 2H2 O(l) ⟶ Ca(OH)2(aq) + 2H2(g)Identify the Lewis acid and the Lewis base among the reactants. The reaction is also an oxidation-reduction reaction.Identify the oxidizing agent, the reducing agent, and the changes in oxidation number that occur in the reaction.1) The net ionic equation for formation of an aqueous solution of Nil2 accompanied by evolution of Coz gas via mixing solid NICO3 and aqueous hydriodic acid is A) 2NICO, (s) + HI (aq) → 2H,O (1) + CO, (g) + 2Ni (aq) B) NİCO, (s) + I- (aq) → 2H,O (1) + CO, (g) + Ni* (aq) + HI (aq) C) NICO, (s) + 2H* (aq) → H,O (1) + CO, (g) + Ni* (aq) D) NICO, (s) + 2HI (aq) → 2H,O (1) + CO, (g) + Nil (aq) E) NICO, (s) + 2HI (aq) → H,O (1) + CO, (g) + Ni* (aq) + 21 (aq) Answer: C 2) The net ionic equation for formation of an aqueous solution of Al(NO,), via mixing solid Al(OH); and aqueous nitric acid is A) Al(OH), (s) + 3HNO, (aq) 3H,0 (1) + Al(NO,), (aq) B) Al(OH), (s) + 3NO; (aq) → 3OH- (aq) + Al(NO,); (aq) C) Al(OH), (s) + 3NO,"(aq) → 30H- (aq) + Al(NO,), (s) D) Al(OH), (s) + 3H' (aq) → 3H,0 (1) + Al³* (aq) E) Al(OH), (s) + 3HNO, (aq) → 3H,0 (1) + Al* (aq) + NO, (aq) Answer: D 3) The balanced reaction between aqueous nitric acid and aqueous strontium hydroxide is Sr(NO3)2 (aq) + H2 (g) A) HNO3 (aq)…
- Sodium phosphate, Na3PO4, is an ingredient of some preparations used to clean walls before they are painted. What is the pH of 1.0 M Na3PO4 (aq)?A student determined the chloride content of a commercial salt by using the Mohr method. A 0.7725 -g sample of the salt was dissolved in distilled water and diluted to a final volume of 250. mL. A 25.-mL aliquot of the analyte solution was then titrated against a standard 0.0347 M AgNO3(aq) solution to the chromate end-point. A blank-corrected volume of 25.96 mL was recorded. Calculate the percent chloride in the sample. Provide your answer to two decimal places and without units.A student determined the chloride content of a commercial salt by using the Mohr method. A 0.7725 -g sample of the salt was dissolved in distilled water and diluted to a final volume of 250. mL. A 25.-mL aliquot of the analyte solution was then titrated against a standard 0.0347 M AgNO3(aq) solution to the chromate end-point. A blank-corrected volume of 25.96 mL was recorded. Calculate the percent chloride in the sample.