Having established these, we can combine them to arrive at the final uncertainty. How do you find the molar mass of an unknown acid if you know the weight of the sample (in grams) and the volume of the solution (250mL)? The acid required 19.3 mL of base to reach the equivalence point. You know the number of moles of NaOH, because it’s the same as the number of moles of KHP. 1 1 4 1.0079 35.453 4 15.999 100.457 /molar mass HClO x m x m x m x g mol Q: Is there a special name for the point at which we’ve put equal moles of acid and. Calculater the percentage, by mass, of NaOH in the impure caustic soda. The molar mass of NaOH is 40.00 g/mol so the mass is 5.928 g 2. Number of moles of NaOH = mass ÷ relative formula mass = 20 ÷ 40 = 0.5 mol. Given Data: The volume of solution is 3000 mL. 99.75 g/mol Since the molar mass of NaOH is 40 g/mol, we can divide the 90 g of NaOH by the molar mass (40 g/mol) to find the moles of NaOH.
Want to see the step-by-step answer? So Moles In 10g of NaOH-10/40=0.25 Volume of solution in Litres -0.1L So Molarity=0.25/0.1=2.5 What mass of sodium hydroxide (NaOH, molar mass - 40.0 g.mol-') is needed to make 100.0 mL of a 0.125 M NaOH solution? A. Want to see this answer and more? The 250cm³ sample must have contained 10X the amount of NaOH in the 25cm³ sample 0.00282 mol / 0.0250 dm 3 = 0.1128 M We could have used M 1 V 1 = M 2 V 2 to get the molarity of the NaOH. Experts are waiting 24/7 to provide step-by-step solutions in as fast as 30 minutes! Determine the amount, in moles, of NaOH in the 25.0cm3 used.
The molar mass of NaOH is 23 + 16 + 1 = 40 g/mole.
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