Since KIO3 is quite neutral, but Na2S2O3 is basic (pH > 7). moles in 124g of the compound = 124g / 248.1841 g/mol = 0.500 mole. Molar mass Na2S2O3.5H2O = 248.1854 g/mol. . 16 Determination of weight of Na2S2O3.5H2O to prepare its q M Weight of Na2S2O3.5H2O=Molarity x Molar mass x Volume/1000 Weight of Na2S2O3.5H2O= q x Molar mass x Volume 1000 Weight of Na2S2O3.5H2O= b g/250.0ml Standardization of prepared Na 2S2O3.5H2O solution 1000ml standard K2Cr2O7 contains p mol of K2Cr2O7 1ml standard K2Cr2O7 contains p/1000 mol of K2Cr2O7 10.0 or â¦ â¢ Na2CO3 + S + SO2 = CO2 + Na2S2O3 â¢ 2 HCl + Na2S2O3 = H2O + 2 NaCl + S + SO2 Molar mass of Na2S2O3*5H2O is 248.1841 g/ mol. The density of sodium thiosulfate corresponds to 1.667 grams per cubic centimetres. 3. Predict the mass of Na2S2O3that could be produced from 38.2 g of Na2S and unlimited quantities of the other reactants, based on the following unbalanced equation: Na2CO3 + Na2S + SO2--> Na2S2O3 + CO2 a. The molar mass of a substance, also often called molecular mass or molecular weight (although the definitions are not strictly identical, but it is only sensitive in very defined areas), is the weight of a defined amount of molecules of the substance (a mole) and is expressed in g/mol. If the strength of Na2S2O3 is M/10, then the volume of Na2S2O3 needed to react completely is? To make sure the reaction would take place, H2SO4 is added. Known Values: Molar mass of Na2S2O3 [g/mol] Molar mass of KIO3 [g/mol] Stock Volume of KIO3 [ml] Molar mass â¦ 3 0? $\endgroup$ â Poutnik May 14 '19 at 18:01 Solid compound Solution. 0.455 moles Assuming that the reaction you meant was: Na_2S_2O_3 + AgBr \rightarrow Na_3(Ag(S_2O_3)_2) + NaBr If I'm wrong tell me in the comments. there are 8 moles of O per mol of compound moles of O in 124 g = 0.5 *8 = 4.0 mol of O the compound is a salt and does not exist as a molecule but 6.02 * 10^ 23 formula units has a mass of 248.1841 g 6 g. What is the molar ratio of N 2 , N O 2 and N 2 O 4 in the original mixture? 71 g B. Elemental composition of Na2S2O3*5H2O: . Z is what you need Now do your homework. It has a white, crystalline appearance as a solid and is odourless. What is the molar mass for the following compound , rounded to the nearest gram ? Fill the flask to mark with distilled water. Na2S2O3 1 See answer PaytonMom is waiting for your help. The optimum mole ratio between NaClO and Na2S2O3 is 4 to 1. Standardization of the Sodium Thiosulfate Solution Make up a standard solution of potassium iodate by accurately âweighing by differenceâ about 0.1 g of KIO3 and placing it in your 100 mL volumetric flask. Formula in Hill system is H10Na2O8S2. The more commonly available pentahydrate from, Na 2 S 2 O 3.5H 2 O has a molar mass of 248.18 g/mol. Stoichiometry problems can be characterized by two things: (1) the information given in the problem, and (2) the information that is to be solved for, referred to as the unknown.The given and the unknown may both be reactants, both be products, or one may be a reactant while the other is a product. Sodium thiosulfate is an inorganic sodium salt composed of sodium and thiosulfate ions in a 2:1 ratio. You find the atomic mass of the elements and × it by the number so Na is in group one which has 23 ram (relative atomic mass) so you × it by 2 and so on and add the results at â¦ Sodium thiosulfate is used in gold mining, water treatment, analytical chemistry, the development of silver-based photographic film and prints, and medicine.The medical uses of sodium thiosulfate include treatment of cyanide poisoning and pityriasis. Na2S2O3 +H2O+Cl2-----)NaSo4 +2HCl Molar mass=m Equivalent mass of Na2S2O3 = ? Lots of things can help lose weight, a good nights sleep, exercise, not eating too much junk food, eating sensible amounts of fruit and vegetables, and yes green tea may help do it's bit by assisting your bowel movement. Given the reaction: Na2S2O3 + AgBr â-> NaBr + Na3[Ag(S2O3)2] A. Mole Ratios. How many moles of Na2S2O3 are needed to react completely with 42.7 g of AgBr? In the standardization of Na2S2O3 using K2Cr2O7 by iodometry, the equivalent weight of K2Cr2O7 is (a) ... Molar mass/3 (d) same as molar mass The molar mass of (NH 4) 2 CO 3 is 96.08582 g/mol. The parenthesis around the ammonium ion followed by the subscript 2 tells us we multiply the... See full answer below. Formula:Na2S2O3 Enter a chemical formula to calculate molar mass,The molar mass calculator can be used in Chemical industry and medicine industry. Formula:Na2S2O3.5H2O Enter a chemical formula to calculate molar mass,The molar mass calculator can be used in Chemical industry and medicine industry. Molar mass of Na2S2O3*5H2O is 248.1841 g/mol. Get the answers you need, now! Find the mass of the solute youâre adding into your solution using a lab scale if you need to. Question: Sodium Thiosulfate (Na2S2O3, Molar Mass - 158.2 G/mol) Is Used In The Development Of Photographic Film. 6 years ago. It contains a thiosulfate(2-). Asked by Wiki User. 10 Na2S2O3 + 2 KIO3 + 12 H(+) --> 5 Na2S4O6 + I2 + 6H2O + 10 Na(+) + 2 K(+) The reaction will only take place in acidic environment. Discussion of Theory. B. Answer. What is the mass of NaBr that will be produced from 42.7 g of AgBr? In its anhydrous form, sodium thiosulfate has a molar mass of 158.11 grams per mole. It has a role as an antidote to cyanide poisoning, a nephroprotective agent and an antifungal drug. But if the iodine is just an intermediate product to be titrated by Na2S2O3, the equivalent mass is M/6. calculate the mass of sodium sulphate required to prepare its 20%(mass percent) solution in 100 g of water Chemistry My prelab is telling me to find the initial concentrations of I(^-) and S208(^2-) given the following reaction: 25 mL of 0.2 M KI + 48.00 mL 0.2 M KNO3 + 1 mL 0.4 M Na2S2O3 + 1 mL starch + 25 mL 0.2 M (NH4)2S2O8 + 1 drop EDTA How do I calculate the ... Molar mass = 248.1864 g/mol . One mole of mixture of N 2 , N O 2 and N 2 O 4 has a mean molar mass of 5 5. If the procedure produced only a 68. 1) Calculate the molar mass of sodium thiosulfate 1 mol Na2S2O3 weighs X grams 2) If you dissolve X grams in 1000 mL you will have a 1 M solution thus for a 0.25 M solution you need Y grams Calculate Y 3) You don't need to prepare 1000 mL but only 500mL thus for preparing 500 mL you need Z grams Calculate Z. tadvisohil886 tadvisohil886 Mass of Na = 23 u mass of S = 32 u mass of oxygen = 16 u Thus, Na2S2O3 = 23(2) + 32(2) + 16(3) = 46 + 64 + 48 = 110 + 48 = 158 u. Add your answer and earn points. Preparation of solutions calculator is a useful tool which allows you to calculate how many solid chemicals or stock solutions you will need to prepare the desired solution. Previous question Next question 1 2 3. Divide the mass you found by the molar mass so you can find how many moles of â¦ View Lab Report - Lab 2 Vitamin C.xlsx from CHEM 09250 at Rowan University. Step One: Write balanced equation The reaction above is not balanced. The Mole Ratio Lab uses the method of continuous variations to determine the mole ratio of two reactants without using the formula of the reaction. (I = 127) My effort: I am unable to find the reaction and products of KI with KIO3 as also the second reaction. Na2S2O3 A. ... mass of the precipitate that forms can be measured. Question: Mass Of Na2S2O3 Used = 1.36 Grams A) Find The Moles Of Na2S2O3 Used To Titrate The Bleach Solution B) ... we know that moles = mass / moalar mass molar mass of Na2S203 = 158 g /mol so moles of Na2S203 = 1.36 view the full answer. Your Summer Job Is At A Photography Lab And You Need To Check The Purity Of An Outdated Supply. 1.5 g of KI is reacted with excess of KIO3 to produce I2 which is reacted with Na2S2O3 in basic medium, where Na2S2O3 converts into SO4 - - and I2 converts into I -. Na2S2O3 That's 2 sodiums at 23 each, 2 sulfurs at 32 each, ... What is the molar mass for the following compound rounded to the nearest gram na2s2o3? Be sure to subtract the mass of the container so you have an accurate reading. For the mentioned reaction, releasing iodine, the equivalent mass is M/5. It is on the World Health Organization's List of Essential Medicines, the safest and most effective medicines needed in a health system. As in the former, the oxidation number change is by 5, in the latter by 6. 4 g. On the heating to a temperature, at which all the N 2 O 4 may be dissociated into N O 2 , the mean molar mass tends to a lower value of 3 9. Molar mass of Na2S2O3 5H2O is 248.2. 153 g C. 158 g D. 254 g molar mass AgBr = 107.87 + 79.90 = 187.77 g/mol mol AgBr available = 42.7 g AgBr x [1 mol / 187.77 g] = 0.2274 mol AgBr from the balanced equation the mole ratio AgBr : Na2S2O3 = 1 : 2 so mol Na2S2O3 required = 0.2274 mol AgBr x [ 2 mol Na2S2O3 / mol AgBr] = 0.455 mol Na2S2O3 (to 3 sig figs) Sodium Thiosulfate Na2S2O3 Molar Mass, Molecular Weight. 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