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- Part IV: Equilibrium Involving Chromate and Dichromate Ions Steps 2 & 3 Step Steps 5 & 6 4 Steps 7 & 8 Step 9 2CrO₂² (aq) + 2 H (aq) Cr₂O, (aq) + H₂O (1) Initial Colour + 1 M NaOH + 1 M HC1 Ba² (aq) + CrO² (aq) BaCrO. (s) 0.1 MK₂CrO₂ Yellow Yellow Yellow Initial Colour + 1 M HC1 + 1 M NaOH 0.1 MK₂CrO₂ + 0.1 M Ba(NO3)2 Other Observations: 0.1 MK₂CrO₂ Yellow Orange Yellow Initial Colour Yellow 0.1 MK₂Cr₂O, Orange Initial Colour + 1 M NaOH Yellow + 1 M HC1 Orange 0.1 MK₂Cr₂O, Orange Yellow Orange 0.1 MK₂Cr₂O₂ + 0.1 M Ba(NO3)2 Orange Orange Orange Immediately cloudy with white precipitate and yellow solution + 0.1 M Ba(NO₂)₂ Orange + 1 M HC1 Orange with precipitation + 1 M NaOH Yellow with precipitation 0.1 MK₂CrO₂ 0.1 MK₂Cr₂O, Immediately a lot of precipitate Very little precipitate formed in formed in yellow solution orange solutionA 10.00cm3 portion of the 100.00cm3 HCl solut was taken from the volumetric flask and was titrated with KOH (aq). It was neeutralized by 24.35cm3 of potassium hydroxide od concentration 0.0500moldm-3. Calculate the concentrat of the original concentrated hydrochloric acid in moldm-3.(c). The traditional way of comparing reactions is by the percentage yields. However, percentage yield takes no account of by-products. In order to decide which chemical process is greener, chemists have tried to develop ways of measuring 'greenness'. One of the most common methods is the atom economy. Calculate the atom economy of the following reactions: (1). CH2 Ph3P-CH2, + Ph3P=0 (ii). он 200 °C (iii). CI, CI .CI CI CI .CI NaOH CI CI
- tes (18) ades Chemistry: Q4: 2022-23 | e 4.4Be + 2He→ 6C+ Ⓒin O On O in 9 Sie leCalc. the alkaline strength of a sample of impure K2CO3 in terms of percent K2O from the ff. data: wt. of sample = 1.000g; HCL used = 55.90 ml;NaOH used = 0.42ml; 1.000mlNaOH 0.008473 g KHC2O4 .H2C2O4 . 2H2O; 1.000ml HCL 2.500 ml NaOH.8:04 PM Fri Nov 27 ll7 43% AA A sjc.cengagenow.com + Latest Line F5 Dynamic... Group Resea... 10-16 Acid-.. Mastery 10-16 X OWLV2 | Onli... G green and w... C dept. C SIERRA SIERRA SIERRA Module 10-12 [Review Topics] [References] 1. Buffer Solu... Use the References to access important values if needed for this question. A buffer solution is made that is 0.376 M in HCN and 0.376 M in 2. Buffer S... 2req Question NaCN. Question If Question Ka for HCN is 3. Buffer Solu... M) -10 4.00 x 10-, what is the pH of the buffer solution? pH : Write the net ionic equation for the reaction that occurs when 0.089 mol HCl is added to 1.00 L of the buffer solution. the lowest pos coefficients. Omit states of matter. Use H3 0t instead of Ht) + + Submit Answer Retry Entire Group 8 more group attempts remaining Progress: 2/3 groups Due Nov 28 at 11:55 PM Previous Next Finish Assignment Save and Exit
- Water sample from different river water was subjected to a qualitative alkaline analysis by titrating against 0.1250 MHC1 and using phenolphthalein and bromocresol green end point. The table below shows the volumes of acid needed to titrate 25.00-mL portions of each sample and their corresponding end point, separately. Use this information to deduce the composition of the solutions. Calculate the molar concentration of each solute. Volume (mL) Phenolphthalein end Bromocresol green Solute identity concentration end point Volume (mL) Molar Sample point 22.40 of solute/s 1 22.41 2 0.00 33.40 3 15.67 42.13 4 29.64 36.424. The molar absorptivities of the indicator weak acid HIn (K₁ = 1.42 x 105) and its conjugate base In at 570 were determined as ε(HIn) = 7120 and ɛ(In) = 961. The optical length b = 1.00 cm. (a) What is the absorbance of an unbuffered indicator solution having total indicator concentration 8.0 × 10%. (b) What is the absorbance of a buffered indicator solution having total indicator concentration 8.0 x 105 and pH = 6.5.Estimate the pf of the resulting solution prepared by mixing 10 mele of selid disodim phosplate ( values for phosphoric cid we 21.72, 124 Oa pH2.1 1.25 mole of lydrochlorie cid. The pka Od pt-72
- A Sample Containfng mmol of KNOS is "parsed 6.00 x10-2² mmol of vesay ad z.00x102 mmol af ves@y ad 2.00x1o2 though a cation -excharye Column. the Colculate. volume o.02.00 M NaH of needed to titrete the elwate,Part D Let that Za(OH) () is pely insoluble, which signs that the precipitation reaction with NaOH(aq) (pred in the transition) would go to completion Za (aq) + 2NaOH(aq) Zn(OH), () +2Na (₂) you had a 50 L son containing 200 M of Za" (aq) and you wished to add enough 1.30 M NaOH(aq) to precipitate at of the metal, what is the minimum amount of the NaOH(aq) solution you would As that the NaOH(o) son is the only ace of OEE (n) for the precipitation Capress the volume to three significant figures and include the appropriate View Av Haljuj ml. 716.72 Show how P = kT(a In Q/OV), leads to PV = nRT.