Standardized NaOH solutions are typically re-standardized if left unused for more than a week or two.  The main concern is exposure to the atmosphere (thus it is important to seal the bottle well each time, and not leave it open during a lab period).  Why is exposure to the atmosphere a concern (be specific)?

Q: A student makes a standard solution of potassium hydroxide by adding 14.555g to 500.0mL of water.…

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Q: Determine the moles of sodium carbonate that need to be taken from the concentrated solution. (To…

A: Given data : Concentrated solution conc. (M1) = 2.80 M Diluted solution conc. (M2) = 0.200 M Diluted…

Q: Determine the molecular weight of the given. Show complete detail of solution. A. Sodium Hydroxide,…

A: A. Sodium Hydroxide, NaOH  Molecular weight of Na = 23 g/mol  Molecular weight of O = 16 g/mol…

Q: Run 1 Volume of Vinegar 2.00 mL Used Concentration of NaOH 0.100 M Initial Buret reading Final Buret…

A: The number of moles (N) of a compound present in V mL of a C (M) solution is calculated by using the…

Q: calculate the number of grams of sodium hydroxide that must be added to 1L of water to make 15%…

A: Given% of solution =15%=15100Volume of solution=1L=1000ml

Q: 6. If you have 1.50 liter of a 1.5 M solution-of NaCl, how many moles of NaCI were dissolved in the…

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Q: 1. How do you prepare 500 mL of a ~0.10 M NaOH solution? What mass of NaOH(s) should you use?

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Q: An unknown sält is freezes at a temperature of-1.4C. What is the formula of the unknown salt? Upload…

A: Formula used: ∆Tf = i Kf m

Q: write a step by step procedure to make 500 ml of a 0.125M lithium oxide solution?

A: For this we have to find the grams of Li2O (lithium oxide) require to dissolve in 500 ml of water to…

Q: Calculate the hydrogen ion concentration and the hydroxide ion concentration in wine from its pH. as…

A: pH gives the measurement of how acidic or how much basic the given solution is. The range of pH is…

Q: If the solution turns blue litmus paper red, then the solution contains acid. The salution turns the…

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Q: What volume (mL) of 0.196 M NaOH is required to neutralize 15.2 ml of 0.436 M HCI? 0.001300 1.300…

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Q: Write a detailed step-by-step procedure for preparing 100 mL of a 0.200 M NaOH solution.

A: Number of moles = mass/molar mass  Mass = moles × molar mass

Q: The soda ash dose necessary to soften this water to 90 mg/ as CaCcO3 if the soda ash is 90% pure is…

A: CaCO3 = 90mg/l

Q: 10dm³ of water added to 2.0mol/dm³ of 2.5dm³ solution of HCL . What is the concentration of the…

A: Given data: The volume of water Vwater= 10 dm3. The volume of HCl VHCl= 2.5 dm3. The concentration…

Q: What volume of 9 M HCl must be used to prepare 1.5 L of 0.25 M HCl?

A: The volume of 9 M HCl that must be used to prepare 1.5 L of 0.25 M HCl is to be determined.

Q: Explain how Compound A and Compound B will dissolve in water using the correct vocabulary including…

A: Compound B is KBr which is an ionic compound formed by transfer of 1 electrons from K to Br atom…

Q: ncentrated HCl is 12.1 M.  Determine the volume in mL of the concentrated solution required to…

A: In the laboratory, the solutions of various concentrations are used. These solutions are prepared by…

Q: If I have 340 mL of a 0.5 M NaBr solution, what will the concentration be if I add 560 mL more water…

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Q: Why are KMnO4 solutions filtered before they are standardized?

A: When a solution is made from the accurate and known quantity of the compound then the resultant…

Q: Calculate the concentration in grams per litre of sulphuric acid whose concentration is 2m ?

A: Molality = number of moles / kg of solvent Given = 2m Molarity = number of moles / 1L number of…

Q: How do I find the moles of NaOH required to neutralise KHP? NaOH = 0.65M solution Moles KHP =…

A: Given,Mass of KHP = 3.3139 gMolar mass of KHP = 204 g/mol Moles of KHP can be calculated as:

Q: calculate the volume of 1 M NaOH needed to prepare 12.0ml of a 0.10-M solution

A: Given :  M1 = 1M , V1 = ? (To calculate) M2 = 0.10M   V2 = 12.0 ml  Now to calculate the volume…

Q: OH OH , H* – ? + HC CHS + 1 equivalent H2, Ni - ? OH H3C - ? エーリーエ エーリーエ エーリーエ エーリーエ エーリーエ エーUーエ…

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Q: A student makes a standard solution of potassium hydroxide by adding 14.555g to 500.0mL of water.…

A: Standard solution is the solution whose concentration is known. Concentration is the ratio of number…

Q: Write a step by step procedure to make 500ml of a 0.125 lithium oxide solution. Be sure to include…

A: Answer :-  To prepare 500 ml 0.125 M lithium oxide (Li2O) solution, dissolve 1.863 g lithium oxide…

Q: What is Saturated solutions

A: Given term,     Saturated solutions

Q: How many mL of water must be added to 197 mL of 1.50 M HCl to give 1.00 M HCl? (Assume the volumes…

A: Given :  Molarity of HCl = 1.50 M  We have to calculate how much water needs to be added to make…

Q: An aqueous solution of hydrochloric acid contains 36% HCl by mass. (a) Calculate the mole fraction…

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Q: Calculate mass of solid NaOH necessary to prepare 1.0 L of 0.10 M NaOH solution.

A: Since you have asked multiple question, we will solve the first question for you. If you want any…

Q: What volume of 12.0 M hydrochloric acid is needed to prepare 1L of approximately 0.2 M HCl?

A: When a concentrated solution of molarity M1 and volume V1 is diluted by adding water to a solition…

Q: Explain how Compound A and Compound B will dissolve in water using the correct vocabulary including…

A: We are given two compounds; NaCl and CO2.

Q: 12 - How many mL of 2.0 M hydrochloric acid would be required to prepare 200.0 mL of 1.0 M HCI?

A: Molarity of a solution is defined as the number of moles of the solute present per litre of the…

Q: Draw a picture to represent the molecular view of the dissociation of HNO3 in water.

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Q: what will the concentration be if I ADD 560 mL more water to it?

A: Given :-  initial concentration = 0.50 M  initial volume = 340 mL  To calculate :- concentration of…

Q: If I have 340 mL of a 0.50 M NaBr solution, what will the concentration be if I add 560 mL more…

A: the concentration  of  NaBr solution after addition of 560 mL more water to it has to be given,

Q: Which of the following is not standardized against sodium carbonate? Section а. H,SO4 b. NaOH С. НСІ

A: In standardization , acid and base are titrated . So we need an acid and a base for standardization…

Q: Calculate the volume of water that must be added to a 10 mL sample of 0.5 M NAOH sc fold dilution. O…

A: Given, Initial volume = 10 mL  Molarity = 0.5 M

Q: 1. Briefly explain why water is considered as the universal solvent.

A: Since we only answer one question at a time, we'll answer the first one. Please resubmit the…

Q: If 100.0 mL and 1.500 M of HCl solution is diluted to 200.0 mL, what will be the final concentration…

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Q: How much 0.600 N base must be added to 750 mL of a 0.200 N base in order for the solution to be…

A: Given: normality of base 1(N1)=0.600 Nnormality of base 2(N2)=0.200 Nnormality of final…

Q: What volume of 0.200 M HCl is just sufficient to neutralize 50.0 mL of 0.400 М Ba(ОН)2? 20.0 mL 50.0…

A: The volume of HCl is to be calculated

Q: Why doesn’t water dissociate to produce 10-7 M H+ and 10-7 M OH- when some HBr is added

A: Le Chatelier's principle, In any reaction, if a reaction at equilibrium is subjected to change in…

Q: If I dilute 250 mL of 0.10 M lithium acetate solution to a volume of 750 mL, what will the…

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Q: What volume of 0.25 M HCl must be diluted to prepare 0.96 L of 2.0×10-²M HCl? L

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Q: 1. Compute for the amount of NaOH pellets needed to prepare 500 mL of 0.1 M solution. 2. Explain in…

A: Molarity is the number of moles of the solute present in per litre solution. It is denoted by the…

Q: MA 1.00 12.0 14.0 15.9 22.9 28.0 30.9

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Q: Explain how Compound A and Compound B will dissolve in water using the correct vocabulary including…

A: compound A is Magnesium chloride which is an ionic compound formed by transfer of two electrons from…

Q: MgBry solution. K water 1.86 'Cim K, water 0.512 "Cim O 9.9 "C 5. 6'66 O 102.1 "C 101.5 C O 101.1 C

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Environmental Pollution

Environmental pollution occurs due to some unwanted alteration in the surroundings which results in unfavorable effects on all organisms of that surrounding.