1224566842 is waiting for your help. 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. check_circle Expert Answer. The weight of NaOH can be calculated as shown below. (a)What is the molar mass of the acid? See Answer. * Sodium Hydroxide (NaOH) - Sodium Hydroxide is the chemical name of NaOH. Therefore the 25cm³ sample contained 2*2.46*10^-3 = 4.92*10^-3 mol NaOH. The no of moles of NaOH will equal the number of moles of the acid; 0.4420 g of the acid id 0.4420/119.3 = 0.003705 moles; therefore 25.00 mL of NaOH solution must contain 0.003705 moles of NaOH. Data Trial 1 Trial 2 Trial 3 Mass KHP Used (g) 1.00 g 1.07 g 1.01 g Molar Mass of KHP 204.22 g/mol 204.22 g/mol 204.22 g/mol Moles of KHP Used 0.00489 mol 0.00523 mol 0.00495 mol Acid:Base Molar Ratio 1:1 1:1 1: Moles of NaOH 0.00489 mol 0.00523 mol 0.00495 mol Initial Volume of NaOH 2.59 mL 7.34 mL 2.49 mL Final Volume of NaOH 27.40 mL 34.8 mL 26.71 mL Volume of NaOH Used 24.81 mL, 0. 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? What is the Ka for the unknown acid? Number of moles of NaOH = mass ÷ relative formula mass = 20 ÷ 40 = 0.5 mol. Firstly, 40% NaOH implies 40 g NaOH in 100g solution. Step-2: Determination of the concentration of H2A: Fill the burette with prepared NaOH and carefully set up the burette with a stand. The concentration is then 0.003705/ 0.025 = 0.1482 M; or 0.1482 moles in 1 L. The molar mass of NaOH is 40.00 g/mol so the mass is 5.928 g The molar mass of NaOH is 40 g/mol. thank you, One commercial method used to peel potatoes is to soak them in a solution of NaOH for a short time, remove them from the NaOH, and spray off the peel. 0.0125 M - 7134032 If 5.20 g NaOH are dissolved in 0.500 L of solution, what is the molarity of the solution? Examples: Fe, Au, Co, Br, C, O, N, F. You can use parenthesis or brackets []. 17 g B. The molarity of solution is 1.5 M. The molar mass of NaOH is 39.997 g/mol. Having established these, we can combine them to arrive at the final uncertainty. Want to see the step-by-step answer? I chose to do the longer calculation. Finding Molar Mass. Determine the amount, in moles, of NaOH in the 25.0cm3 used. B. Which statement best explains the symbol [NaCl]? If the solution contains 20 g of sodium hydroxide - 14317742 makaylaheifort624 makaylaheifort624 01/03/2020 Chemistry High School The molarity of a sodium hydroxide (NaOH) solution is 0.2 M. If 20 g of Na reacts completely with 3 L water, the reaciton is 2Na(s)+2H20-->2 NaOH + H2(g) the final volume of the system is 3 L. what is the molar mas of the NaOH and what is the molarity of the NaOH solution? Find the number of moles of sodium hydroxide with the mass of 2.0 g. [Relative atomic mass: H, 1; O,16; Na, 23] Solution: Relative formula mass of sodium hydroxide, NaOH = 23+16+1 = 40 So, the molar mass of NaOH = 40 g mol-1 From the equation, 2 mol of NaOH reacts with 1 mol of Na 2 SO 4, so 0.5 mol of NaOH … C. Calculate the molar amount of solid KHP used to neutralize the NaOH solution. These relationships can be used to convert between units. is this related to a titration? I am trying to find the molarity of the acid but I don't know the molar mass of the unknown acid to finish my problem. Experts are waiting 24/7 to provide step-by-step solutions in as fast as 30 minutes! Calculate the mass of solid KHP needed to react completely with 25ml of a 0.20m NaOH solution. Solution for What mass of sodium hydroxide (NaOH, molar mass = 40.0 g∙mol–1) is needed to make 100.0 mL of a 0.125 M NaOH solution? Use uppercase for the first character in the element and lowercase for the second character. Shake the flask to dissolve the solute. My base is NaOH. (Molar Mass of NaOH = 40 g/mol) Take X gm of NaOH in 250mL volumetric flask and add small amount of distilled water. The molar mass of "NaOH" is "39.997 g/mol". Molality of resulting solution is: Visit BYJU'S to understand the properties, structure and uses of Sodium Hydroxide (NaOH) explained by … Given that the molar mass of NaOH is 40.00 g/mol, what mass of NaOH is needed to make 2.500 L of a 2.000 M NaOH solution? 3) Moles of NaOH neutralize, then the NaOH molarity: Based on the 1:1 molar ratio, we know that 0.00282 mol of HCl neutralized 0.00282 mol of NaOH. 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. Calculater the percentage, by mass, of NaOH in the impure caustic soda. The 250cm³ sample must have contained 10X the amount of NaOH in the 25cm³ sample Given Data: The volume of solution is 3000 mL. Assuming that each acid particle contains two acidic hydrogens and both are neutralized, what is the molar mass of the unknown acid?" To make 250 ml of 0.1 M NaOH, you dissolve 1 gram NaOH in enough water to make a final volume of 250 mls. Finally add more water up to 250mL mark. 10% solution of NaOH means 100ml of solution contains 10 g of NaOH. 2. Thus, 0.025 moles NaOH x 40 g/mole = 1 gram NaOH. This the same as multiplying by the reciprocal of 40 g/mol. The molar mass of glucose can be calculated by multiplying the molar masses of its atomic constituents by their frequency in a single molecule and adding those values together. Check out a sample Q&A here. 3. Complete these exercises after reading the experiment but before coming to the laboratory ... solution of NaOH, 25.00 mL of the acid required 12.15 mL of a 0.100 M aqueous NaOH solution for complete neutralization using phenolphthalein as indicator. A. First we establish the uncertainty for each of the five primary sources—the mass of KHP, the volume of NaOH at the end point, the purity of the KHP, the molar mass for KHP, and the titration’s repeatability. 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)? 2.0 mL of 10.5 M H2O2, where H2O2 has a molar mass of 34 g/mol. The acid required 19.3 mL of base to reach the equivalence point. Determining the Molar Mass of a Compound. Click hereto get an answer to your question ️ 20 g of NaOH (Molar mass = 40 g mol^-1 ) is dissolved in 500 cm^3 of water. Thus, mass of NaOH = 40g No. So, the molar mass of CO 2 = 44 g mol-1 Mass of 1.5 moles of CO 2 = number of moles x molar mass = 1.5 x 44 = 66g. 40 g C. 39 g D. 36 g E. 43 g Converting between mass, moles, and particles This flowchart illustrates the relationships between mass, moles, and particles.