How many moles of Nal would be found in 250mL of a 4.5 M solution? Write your answer with three digits beyond the decimal point (IMPORTANT - zeroes count as a digit)
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- If your 16x concentrated stock solution contains 20g of NaCl per liter, how much Nacl would one liter of your working solution contain? Round your result to 2 decimal points. g of NaclWhat would you expect to see if you were to create a solution that has 20.0 grams of the NaCl and the solubility is 35.0 g in 100 mL? What type of solution is this? Format B I U ... >Lab Data Verify your concentration calculation. Did you report your data to the correct number of significant figures? Stock solution Concentration iron(III) nitrate 0.40000 [Fe(NO3)a] (M) Color of iron(III) nitrate yellow Concentration potassium thiocyanate [KSCN] (M) 0.00300 Color of potassium thiocyanate colorless Volume iron(III) nitrate (mL) 10.00 Volume potassium thiocyanate (mL) 2.00 Volume DI water (mL) 8.00 Concentration iron(III) thiocyanate ion in stock solution [FESCN2"] (M) 0.000300 Color of stock solution red-orange Diluted solutions Solution 1 Solution 2 Solution 3 Volume stock solution (mL) 4.00 4.00 4.00 Volume DI water (mL) 1.00 2.00 3.00 Concentration iron(III) thiocyanate ion [FeSCN2*] (M)
- How many grams of NaOH would you need to make 3,982 mL of a 3 M NAOH solution (m.w. = 40.00 g/mol)? Report your answer in the requested units to the nearest 2 decimal places (Example "40.02"). Do not report the units in your answer; enter the numbers only. It is recommended that you do not round between calculation steps.given a stock solution of 10% dextrose, how would you make 5 mL of a 0.9% dextrose solution? find mL of stock and mL of h20You want to prepare a 15 mL gel containing 0.8% (weight /volume) agarose. How much agarosedo you need to weigh to prepare the solution? Show all your calculations.Hint: Write down the units for 0.8% knowing that agarose is a powder that is mixed with aliquid
- Determine the molarity of 3.72 moles of NaBr in 575mL of solution. (MM NaBr= 102.89 g/mol) Report your answer to 3 significant figures. Do not include the unit when writing your answer.If you want to make 7 L of 1X TGS (Tris/Glycine/SDS Running Buffer) using 8 x TGS stock, how much of the 8 x stock do you need? Report your answer to 1 decimal place.Question/ Calculate the pH and pOH of a 1.0 x 107 solution HCI ?
- A saline solution contains 1.00 g of NaCl (molar mass = 58.55 g/mol) in 75.8 mL of solution. Calculate the concentration of NaCl in this solution, in units of molarity. %3D Express the concentration in molarity to three significant figures. ? MA chemist prepares a solution of aluminum sulfite (Al, (SO,).) by measuring out 179. µmol of aluminum sulfite into a 300. mL volumetric flask and filling the flask to the mark with water. Calculate the concentration in mmol/L of the chemist's aluminum sulfite solution. Be sure your answer has the correct number of significant digits. mmol x10A buffer contains 0.015 mol of lactic acid (pK₁ = 3.86) and 0.080 mol of sodium lactate per liter. H₂C OH Lactic acid OH Calculate the pH of the buffer. H₂C. Calculate the change in pH after adding 9.0 mL of 0.10 M HCl to 1.0 L of the buffer. O OH Sodium lactate Calculate the change in pH after adding 9.0 mL of 0.10 M HCl to 1.0 L of pure water. O Na+ buffer pH: buffer pH change: water pH change: units units