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- (a) The pH of a solution is 5.42 + 0.05. Find [H1] and its uncertainty. (b) What is the relative uncertainty in [H1]? (c) Show that the relative uncertainty depends on the uncertainty in pH, but not on the value of pH.(a) Show that the formula mass of NaCl is 58.443 (+0.002) g/mol. (b) You dissolve 2.634 (+0.002) g of NaCl in a volumetric flask with a volume of 100.00 (+0.08) mL. Express the molarity of NaCl and its uncertainty with an appropriate number of digits.(b) 0.74 MMgSO4 lons: So,2- O So,- SO- Sot Mg2+ Mg* 04 [cation*] = %3D M [anion]= M %3D
- Your instructor has asked you to prepare 2.00 L of 0.169 M NaOH from a stock solution of 53.4 (60.4) wt% NaOH with a density of 1.52 (60.01) g/mL. (a) How many milliliters of stock solution will you need? (b) If the uncertainty in delivering the NaOH is 60.10 mL, calculate the absolute uncertainty in the molarity (0.169 M). Assume negligible uncertainty in the formula mass of NaOH and in the final volume, 2.00 L.Can you please help calculate the reduced mass, μ, for a C-H bond. Answer to 2 decimal places.6. C) Hydrated barium chloride can be crystallised from solution Hydrated barium chioride has the formula BaCl O and a molar mass of 244 3gmal Determine the value of x in the formula of BaCh•xH,O. Show your working.
- If the plant poduces 1.6*10- kg(1600 metric ton) of Cl2 daily, estimate the quanties of H2 produced 2NaCl(aq) + 2H2O(l)--> 2NaOH(aq) + H2 (g) + Cl2 (g)Answer choices for blank 1: R S Answer choices for blank 2: R S Answer choices for blank 3: R S Answer choices for blank 4: R SA solution containing Cu2+ is analyzed by atomic absorption and gives an absorbance of 0.01000 units. The solution is spiked to increase the Cu2+ concentration by 2.000 mg/L and then gives an absorbance of 0.01613 units. (a) What is the concentration of Cu2+ in the solution (mg/L)? (b) The 1.000 mg/L solution of Cu2+ alone gave an absorbance of 0.00408 units; was the standard addition needed? Yes or No
- (a) For use in an iodine titration, you prepare a solution from 0.222 2 (+0.000 2) g of KIO3 [FM 214.001 0 (+0.000 9)] in 50.00 (+0.05) mL. Find the molarity and its uncertainty with an appropriate number of significant figures. (b) Would your answer be affected significantly if the reagent were only 99.9% pure?(b) 1.9-BBN 2. H₂O2, KOHFor each of the following processes, does the potential energyof the object(s) increase or decrease? (a) The distancebetween two oppositely charged particles is increased.(b) Water is pumped from ground level to the reservoir of awater tower 30 m above the ground. (c) The bond in a chlorinemolecule, Cl2, is broken to form two chlorine atoms.