What mass of potassium nitrate KNO3 should be added to 255 g of water to prepare a 15% (m/m) solution of KNO3? [Molar mass KNO3= 101.1 g/mole] 2. Determine the mass of sodium chloride (NaCl) required to prepare a 300 ml Mueller-Hinton broth solution supplemented with 5.5% (wt/vol) sodium chloride solution. [Mwt NaCl = 58.44 g/mol] 3. You have dissolved 45 g of magnesium sulphate in 300 ml distilled water (dH2O). What is the concentration of this MgSO4 solution expressed as % (m/v)? [Mwt MgSO4 = 120.37 g/mol]

It required 66.66 mL of 2.000 M HBRO3 to titrate (neutralize) 50.00 mL of an Al(OH)3 solution. What is the molarity, M, of the aluminum hydroxide solution ? 3 HBRO3 + Al(OH)3 З Н-0 + Al(BrOз)з Answer a few questions before giving the final answer in the last problem. How many moles of Al(OH)3 are required to neutralize the acid ? A. 0.3999 mol B. 0.1333 mol C. 0.09998 mol D. 0.04444 mol

I want to make a buffer solution containing 1 M glycene pH = 10 (Na+), 1 mM ZnCl2 , 1 mM MgCl2. I have the stock solutions 1 M glycene, 1 M MgCl2, 1 M ZnCl2, and 10 M NaOH. My final volume of buffer solution needs to be 250ml. how much (in ml) of each solution should i put into my buffer?

2. 3. Perform all the calculations necessary for the volume of stock solution or water, in mL, needed to make the dilute solutions listed below. a. b. C. Make: 200 mL of 30% Ethanol dilute solution Stock Volume needed (mL) 95% Ethanol Reagent water Make: 100mL of .09%NaCL Stock 1% NaCl Reagent water 30% SDS 3 M NaOH Make: 100 mL of a 3% SDS and 0.5 MNaOH dilute solution as follows: Stock Volume needed (mL) Reagent water 200 mL Total 1% Lactose 1% Dextrose Volume needed (mL) 100 mL Total Calculate the grams of chemical needed for each stock listed below. Concentration of Stock to Prepare Volume of Stock Needed 1% Sucrose 100 mL Total 10 mL 20 mL 25 mL Amount of chemical Needed (in grams) Your instructor will have you make ONE of the above solutions-ask your instructor which solution to make.

You are supplied with the following: / Jy word voorsien van die volgende: NaCl (Mr= 58,443 g /mol) 2.5M Tris-Cl, pH 8 solution /oplossing (1 Litre) EDTA (Mr= 380,2g/mol) 10% sodium dodecyl sulphate solution / natriumdodecyl sulfaat oplossing Proteïnase K solution / oplossing (50 mg dissolved / opgelos in 1 ml ddH2O) You need a digestion buffer consisting of the following: / Jy moet 'n verteringsbuffer op maak wat uit die volgende bestaan: 15m M NaCl 75 mM Tris-Cl,pH 8 16 mM EDTA,pH 8 0.8% sodium sulphate / natrium dodecyl sulfaat 0,75 mg/ml proteïnase K How will you prepare 500 ml of the digestion buffer? Show all your steps and calculations. Remember to explain exactly how you will make it up. / Hoe sal jy 500 ml van die verteringsbuffer voorberei? Wys al jou stappe en berekeninge. Onthou om te verduidelik presies hoe jy dit sal op maak.

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