Beaker 1 2 3 4 [FeSCN²+] (copy this from your prelab calculations) 1.6x10 1.2x10" M 8x105M 4x10 "M Best-fit line equation: Absorbance 0.631 0.531 0.306. 0.166 Beaker A B C Absorbance [FeSCN2Jeq 0.222 0.282 0347 6.298x10-5 7.9462105 9.732x10
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- 14. A so-called PBS buffer (phosphate buffered saline) is prepared by according to the given protocol: ● Prepare 800 mL of distilled water in a suitable container; ● Add 8 g of NaCl to the solution; Add 200 mg of KCl to the solution; Add 1.44 g of Na₂HPO4 to the solution; Add 245 mg of KH₂PO4 to the solution; Adjust solution to desired pH (typically pH ≈ 7.4); and Add distilled water until volume is 1 L. (a) Calculate the pH of the initial solution (before pH is adjusted). (b) How many moles of acid or base are required to adjust the pH to 7.4?100 mL of 0.10 M NH3 (Kb = 1.8 x 10-5) are mixed with 100 mL of 0.10 M HCN (Ka = 4.9 × 10-10). Which statement is true? (3) The resulting solution is neutral O (2) The resulting solution is basic O (4) No answer is correct as not enough information is given. O (1) The resulting solution is acidic E D Moving to the next question prevents changes to this answer. 4 R F % S T G 6. & 7 H C 8 00 K M Question 2 of 37C 1. The V C What Cc A My Home A Activity 1Alabama O Dashbo ginent/takeCovalentActivity.do?locator=assignment-take 身 口 [Review Topics) (References) Use the References to access important values if needed for this question. The pH of an aqueous solution of 9.81x102 M carbonic acid, H„CO3 (aq), is Submit Answer Retry Entire Group 1 more group attempt remaining Previous Next ENG US End Insert Home F9 F10 F7 8. T Y U
- The chemical 5-amino-2,3-dihydro-1,4- phthalazinedione, better known as luminol, is used by forensic scientists in analyzing crime scenes for the presence of washed-away blood. Luminol is so sensitive that it can detect blood that has been diluted 10,000 times. A basic solution of luminol is often sprayed onto surfaces that are suspected of containing minute amounts of blood. Luminol has a molecular weight of 177 g/mol. The forensic technician at a crime scene has just prepared a luminol stock solution by adding 17.0 g of luminol into a total volume of 75.0 mL of H₂O. What is the molarity of the stock solution of luminol? Express your answer with the appropriate units. ► View Available Hint(s) molarity of luminol solution = 1.28 M Submit Correct Part B Previous Answers Before investigating the scene, the technician must dilute the luminol solution to a concentration of 4.00 × 10-2 M. The diluted solution is then placed in a spray bottle for application on the desired surfaces. How many…The chemical 5-amino-2,3-dihydro-1,4-phthalazinedione, better known as luminol, is used by forensic scientists in analyzing crime scenes for the presence of washed-away blood. Luminol is so sensitive that it can detect blood that has been diluted 10,000 times. A basic solution of luminol is often sprayed onto surfaces that are suspected of containing minute amounts of blood. Luminol has a molecular weight of 177 g/mol The technician must dilute the luminol solution to a concentration of 5.00×10−2 M . The diluted solution is then placed in a spray bottle for application on the desired surfaces. How many moles of luminol are present in 2.00 L of the diluted spray?Give typed explanation not written Consider the following Ka values for phosphoric acid, H3PO4.Ka1 = 7.1 x 10-3Ka2 = 6.3 x 10-8Ka3 = 4.2 x 10-13a.) What is the pH of a 4.0 M solution of H3PO4? b.) Determine the effectiveness of H2PO4acting as a base by calculating its Kb. c.) What is the pH of a 4.0 M solution of Na3PO4 (not H3PO4)?
- dissolve an aciad iL we we'ak wea. HzH in wate, the solution volume willbe looml, and its pH=27 if you know that Ka=1*(10^-7) and the molecular weight of H2A = 34 g/mol find the Weight of dissolved acid H2A?? %3D 1:47 AM /nal Extra Credit) Use the References to access important values if needed for this question. The pH at 25 °C of an aqueous solution of the sodium salt of hydrocyanic acid (NaCN) is 11.15. Calculate the concentration of CN in this solution, in moles per liter. Ka for HCN is equal to 6.2x10-10what is the ph of 0.31 M F solution? Ka = 1.5x10 ^-6> Report to 2 decimal placing.
- NTH assign one of the Trials to pe iment. Upon completion of your exper Volume (mL) 7.0 NICI₂6 H₂O mass of Nicl₂ •64₂0= 2.80 volume of 4.0 M C₂ 48 W₂ = 7.5 1 7.5 mass of witch glass 29.7189 mass of prodiect & watch ghasi 31.9739 mass of the product: 2.269. the pH is a light green & a 7 on the scale. Tria (3) shade. 0 the beaker until you obtai ation of the solid. filtrate in filter blask is pick- Lavener so C₂ 48 No is the excers reasent opwise to the solid unti mL. Record your obses 10 mL graduated cyli 7. Pour tion beaker, dropwise to the bea all of the solution, ges observed dur Ni Cl₂ · 6 Fl₂0 was the lumiting vergent. sti da second 5 mL aliquot RECOVE AL beaker th the ace ted cyli the be 5 mL aliquot of acetone to theWrite the K, expressions for the following two reactions. 1st attempt l See Perio Part 1 Do not include states of matter, multiplication symbols, or extra spaces. Use brackets [] to indicate concentration. If the concentration of a substance should be "1", then do not include it in the expression. Complete the Kexpression for the weak acid behavior represented by НСООН (аg) + н(аg) +НСОО (ад) X x, = +, log. cos. K.AN Careers 4 Texas Workfor Mc Homework X W College Physic online.hccs.edu/courses/188795/assignments/3601808 ne diter rep 4 al 1O.17am mework Ch16- Attempt 1 blem 16.35 11 of 15 Constants | Periodic Table rarl E Complete the second row. Complete the following table by calculating the missing entries and indicating whether the solution is acidic or basic. Express your answer using two significant figures. Acidic or [H+] [OH-] pH pOH basic? 7.4x10-3 M ΑΣφ 3.3x10-10 [H*] 8.25 5.73 DOLB f1o 1. 10 insert I