Why 98% H2SO4 is not corrosive with Mild Steel?

samuel

• Sep 26th, 2017

Absence of free ions in 98%h2so4 leads no corrosion.

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skyjuice

 Profile Answers by skyjuice Questions by skyjuice

• Jan 29th, 2010

Drying, Leaching, Evaporation, Distillation, CrystallisationNo Chemical Process Occur.

THEODOLITE UN

• Jul 27th, 2006

I want to acess the answers to the respective questions.

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Why do we place hydrogen cylinder horizontal position rahter than vertical position?

kati znbc

• Sep 6th, 2011

Hydrogen is lighter than air , if placed vertically,cause the more pressure on the top of the valve of a cylinder , horizontally placing reduces the risk .

kartikey singh rajput

 Profile Answers by kartikey singh rajput Questions by kartikey singh rajput

• Jul 31st, 2011

Cylinders carrying toxic substances, such as sulphur dioxide, must only be transported vertically. Cylinders containing acetylene must always be kept and transported in an upright position.Horizontal...

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Why ACTIVITY is so useful than considering PARTIAL PRESSURE in thermodynamics point of view?

sekhar reddy

• Apr 1st, 2013

A=f/p,activity coefficient describes the deviation in ideal behavior of any liquid when it a non ideal mixtures ,which is dimensionless

nandha.rajesh

 Profile Answers by nandha.rajesh Questions by nandha.rajesh

• Feb 19th, 2010

I think activity means activity coefficient if it is that then it it is very easy to answer your question. Generally partial pressure term is used when there is mixture means more than one compund is ...

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Explain What is Wilson Equation?

mohammadhosein samet

• Jun 4th, 2012

The Wilson equation was published by Grant M. Wilson as Vapor-Liquid Equilibrium. XI. A New Expression for the Excess Free Energy of Mixing

raj kumar sitaliya

• Oct 6th, 2011

Wilson plot /equation is the graphical calculation of convective heat transfer coefficient is proportional to Uexp 0.8.

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Why Iron Carbide diagram can be established upto 6.67% only? What are structure beyond 6.67% carbon.

Samayaraj

• Aug 27th, 2011

Molecular weight of iron carbide(Fe3C) is 179.5

Atomic weight of carbon is 12

Percent carbon = (12/179.5)*100 = 6.67%

aqsa rana

 Profile Answers by aqsa rana Questions by aqsa rana

• Jun 13th, 2010

The iron-iron carbide diagram is only upto 6.67%, because beyond that percentage structure remains the same so we do not study further.

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When salt is added to water, what happens to its freezing point?

vbijendra

 Profile Answers by vbijendra Questions by vbijendra

• Sep 5th, 2009

For pure substances, there is no change in their freezing point, due to addition of impurities, freezing point decreases.

deepakjsd

 Profile Answers by deepakjsd Questions by deepakjsd

• Jul 28th, 2009

Freezing point decreases.

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What are the major characteristics of a metal which distinguishes itself from any other metal?

aqsa rana

 Profile Answers by aqsa rana Questions by aqsa rana

• Jun 13th, 2010

There are some important charestristics of metals that distinguish them from other materials, like in some metals (Al), have high strength to weight ratio.  Metals are good conductors of heat and electricity. They are malleable and ductile.   

kirthi.nataraj

 Profile Answers by kirthi.nataraj Questions by kirthi.nataraj

• Aug 19th, 2009

By its melting point, stability and rigidity.

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Suppose I Have Two Hydrocarbon Mixtures ,Each Mixture Has Known Composition & Freezing Point , Is There Any Empirical Formula To Calculate The Freezing Point Of a Blend Of Those Mixtures?

neeru srangal

 Profile Answers by neeru srangal Questions by neeru srangal

• Aug 17th, 2014

delta T = (Freezing point of pure solvent) - (Freezing point of solution) = kf * m
m= molal conc of solution (moles of solute/ kg of solvent)
kf = freezing point depression constant

Debu

• Feb 7th, 2014

Antoine eq may be used for find out temp if vapor pressure is known for both substance ..then average of that may be answer .

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shah siddharth j

• Feb 24th, 2015

Pseudo pressure is the mathematical expresion accounts for variable compressibility and viscosity of gas with respect to pressure

suji

 Profile Answers by suji Questions by suji

• Mar 19th, 2012

In regard to pressure the mathematical pressure function for the variable viscosity and compressibility of gas is Pseudo-pressure or real gas potential. Its the changes that occur in gas properties with pressure.

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As we know steel making is done in a furnace at very high temperatures, but how is that temperature maintained in a furnace on continuous basis ??

paul ericson

• Jul 22nd, 2015

We can control the fuel rate to the furnace.for this we can use air-ratio control system where your process instrumentation control comes in to play. refer( air ratio control system)

Nihar

• Jun 2nd, 2015

It is maintained by flow rate of natural gas or any fuel that is used for furnace... and this high temp is measured by thermocouple and from thermocouple we change the rate..

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Why there is coating in cement mill fan and separator ?

ashwin

• Dec 7th, 2015

Because particles adhere to fan due to static electricity so usually acoustic sounding horn is attached to fan casing coating too helps

shabhar

• Dec 4th, 2015

May be to prevent corrosion or to prevent the chemicals to react with the metals.

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The Carnot co-efficient of performance (COP) of a domestic air conditioner compared to a household refrigerator is, less or more? Can any one help me out with an explanation...

Nandita Baral

• Mar 20th, 2017

The COP of a Refrigerator/AC would be given by expression: COP = (Cooling Effect/Power Input). The cooling effect produced by a refrigerator is obviously more for a refrigerator. At the same time th...

sunny vanza

• Feb 21st, 2016

It is less.

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How we can find specific heat, enthalpy, minimum ignition Energy and other thermodynamics properties of a new compound in pharma manufacturing industry.

Rushikesh urane

• Jul 18th, 2018

There are many calculation for thermodynamics .......like specific heat=s=q/m*dT

ashish mishra

• Sep 7th, 2016

There are many methods available for calculation of thermodynamic properties. Use chemical properties handbook by Yaws.

like heat capacity : cp=A+Bt+ct^2 +Dt^3
Where ABCD are different values for different compound.

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What is the Density of Steel?

Akash

• Apr 26th, 2018

Mass divided volume is for density

Anietie Udoh

• Jun 30th, 2017

8.05g/cm3 or 8050kg/m3

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What is the difference between coagulation and flocculation?

Ankit Yadav

• Oct 18th, 2017

Coagulation is the chemical process for separation of Effluent from water by adding some coagulants like aluminum sulfate aluminum chloride. when flocculation is a physical operation of removing eff...

Anietie Udoh

• Jun 30th, 2017

Coagulation is purely a chemical process in which the coagulant, often a salt, (e.g Alum) breaks down to release charges which induces the settling of the particles of a suspension while Flocculation is a physical process. The flocculant is often a polymer which induces the settling of particles.

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Why Stainless Steel is not corrosive?

Dibyendu Mandal

• May 18th, 2018

Stainless Steel contains cr.

Nijal Shah

• May 2nd, 2018

Stainless steel contains some percentage of chromium. Chromium reacts with oxygen to form Cr2O and thus prevents further oxidation of iron to form rust, so SS is noncorrosive

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What is the important properties of biodegradable plastics?
Which properties helps plastics to resist water?

VIVEK32043

 Profile Answers by VIVEK32043 Questions by VIVEK32043

• Jan 25th, 2017

Biodegradable polymers are those which are decomposed after their useful service life to end products like minerals, oxygen, etc. with the help of micro organisms under normal environmental conditions.

Khalid Ibrahim Jamadar

• May 24th, 2016

Biodegradable polymers, have extremely strong carbon backbones that are difficult to break, such that degradation often starts from the end-groups. Since the degradation begins at the end, a high surf...

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What is the role of software in process equipment design and what software should one refer to while dealing with related problems?

Aakash

• Sep 17th, 2017

Software are necessary because they are used in simulation of a process for example to find out the composition of distillate and bottom product of distillation column and we can also vary the number ...

Sandeep cheekati

• Mar 14th, 2016

We can use Dynochem, Visimix, Aspen plus

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What is the effect of pressure in the Distillation Operation? It is also said that when the vapor pressure of the liquid component equals the atmospheric pressure, boiling occurs; can anyone give me an example for this type of Distillation?Thank you

Sina Salimi

• May 30th, 2016

Increasing pressure makes separation harder, because it decreases relative volatility

rohit

• Sep 3rd, 2011

If we increase the pressure, the no. of stages in a distillation column becomes less as the liquid boils earlier (boiling occurs when the atmospheric pressure becomes equal to the vapour pressure of the liquid.)

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