Chemistry question and answers for July 26, 2023
- Q 1. Graduated cylinders are not as precisely calibrated as areburets or volumetric pipets. Briefly explain why it is acceptableto measure the KI and HCI solutions used in the titration withgraduated...
- Q A 0.450 gram sample of impure CaCO3 (s) is dissolved in 50.0 mLof 0.150 M HCl (aq). The equation for the reaction is CaCO3(s) +2HCl --> CaCL2 (aq) + H2O...
- Q The Common-Ion Effect and pH Buffers1. Calculate the pH at 25°C of 1.00 L of abuffer that is 0.120 M HNO2 and 0.150M NaNO2 before and after the addition of...
- Q Write the complete redox and the two half-reactions for thereaction of aluminum and copper. Which species is oxidizing agent?The reducing agent? How many electrons were transferred?A compound containing xenon and...
- Q A. While both NaBH4 and LiAlH4 can both be used to reduceketones and aldehydes, the procedure that you followed in lab wouldnot result in the fluorenol product if NaBH4 were...
- Q The value of Kc for the reaction:N2O4(g) ↔ 2NO2 (g)is 0.21 at 373K. If a reaction vessel at that temperatureinitially contains 0.030M NO2 and 0.030MN2O4, what are the concentrations of...
- Q At 2300 K the value of K of the following reaction is 1.5 x10-3:N2(g) + O2(g) ↔ 2NO(g)At the instant when a reaction vessel at 2300K contains 0.50MN2, 0.25M O2,...
- Q Calculate the pH of a solution formed by mixing 65 mL of 0.16 MNaHCO3 with 75 mL of 0.29 M Na2CO3. Express your answer using twodecimal places.
- Q Subtract/Multiply/Divide using Significant figures1.(16.75 - 6.2) x (9.56 x 10-19)------------------------------------------(6.753.2) x (8.5679 x 1011)This is just one problem, just dividing it2. Convert 9.64 x 1014 pm3 tonanometers
- Q what is pH of 15.0g KH2PO4 + 27.0 g Na2HPO4 dissolved in H2Oplus enough H2O to fill to 1L
- Q Assuming 100% yield, how much hexynyl lithium is produced fromthe reaction that you performed in the lab of LiMDS with 1-hexyne(0.22 mL)? Using 1 mL of 1.0 M lithium bis(trimethylsilyl)amidesolution...
- Q Explain the purpose of the components of an acrylamidegel.
- Q Calculate the pH of a mixture that contains 0.13 M of HNO3 and0.20 M of HC6H5O.
- Q Co(II) was used as an internal standard to analyze a sample ofTi(IV) with atomic absorption spectroscopy (AAS). A standardmixture containing 1.40 μg Co/mL and 1.35 μg Ti/mL measured by AASproduced...
- Q Please explain the science behind municipal water treatmentincluding chlorination and alternatives to chlorination (UVradiation, etc).
- Q Consider these liquids.Dishwashing detergent: 1.03 density g/mLMaple syrup: 1.37 density g/mLVegetable oil: 0.91 g/mLa. if you pour equal volumes of these three liquids into a 250milliliter graduated cylinder, in what...
- Q Why is it impossible to measure an excimer absorption spectrum,even for highly concentrated solutions? Illustrate your answer withan energy diagram
- Q In the fed state, glucose is directed towards certain metabolicpathways in the liver(many of which are regulated at least in part by insulin). Indicatethe potential metabolic fatesof glucose in the...
- Q Part AAs a technician in a large pharmaceutical research firm, youneed to produce 150. mL of a potassium dihydrogen phosphate buffersolution of pH = 7.00. The pKa of H2PO4− is...
- Q 1.) A voltaic cell utilizes the following reaction and operatesat 298 K:3Ce4+(aq)+Cr(s)→3Ce3+(aq)+Cr3+(aq).What is the emf of the cell when [Ce4+]= 1.3×10−2 M ,[Ce3+]= 2.6M , and [Cr3+]= 1.7 M ?2.)Calculate...
- Q The solubility of Cu2CrO4 in water at 25 °C is 1 x 10–4 mol L–1.The solubility product constant at this temperature is
- Q If the Ka of a monoprotic weak acid is 7.0 × 10^-6, what is thepH of a 0.24 M solution of this acid?
- Q Part A. Calculate the pH of a buffer solution that is 0.250M in HCN and 0.168 M in KCN. For HCN, Ka =4.9×10−10 (pKa = 9.31).Part B. Calculate the pH...
- Q Fresh feed containing 55 wt% A and 45 wt% B flowing at 100kg/henters a separation system that removes a portion of pure componentA only, as a bottom product. The top...
- Q A beaker with 1.80×102 mL of an acetic acid buffer with a pH of5.000 is sitting on a benchtop. The total molarity of acid andconjugate base in this buffer is...
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