Nguyễn Phú Trọng

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Questions related from Nguyễn Phú Trọng

How to dissolve PbS (lead II sulfide)?

I need a solvent which it can dissolve PbS (lead II sulfide) well. I can't use nitric acid because it destroy S2- in PbS.

06 June 2019 2,323 7 View

How to determine content of Ca2+ in CaHPO4.2H2O?

I can use HCl to dissolve CaHPO4.2H2O (CaHPO4.2H2O was created from Ca(OH)2 and H3PO4 with ratio 1:1, respectively) and use photometry method to determine PO43-. But Ca2+, how to determin Ca2+? If...

11 November 2018 1,090 3 View

Conditions of using photometry analysis?

What is the concentration range that can be used in photometry?

11 November 2018 805 0 View

Prepare phenolphtalein 0.05%?

I read some papers about preparing phenolphtalein 0.05%. Add 0.05g phenolphtalein in a beacher and add 50mL ethanol 95% and 50mL distilled water. But I can exchange acohol content (such as 100mL...

11 November 2018 7,282 3 View

Why electrons don't directly move to hole transfer layer (HTL) in halide peroskite solar cell that flow round outer circuit?

And which layer is solid electrolyte in a halide peroskite solar cell?

11 November 2018 8,952 2 View

Solubility of silicate?

Why Na2O.2SiO2 doesn't dissolve in water, otherwise 3Na2O.2SiO2 can dissolve in water?

10 October 2018 4,606 2 View

Mechanism of solar cell?

I don't understant about mechanism of solar cell. When light come in p-n juction is electron and hole will be separated at n semiconductor, p semiconductor, depletion region or all

09 September 2018 8,009 7 View

What is the mechanism of inhibiting ions in metallic incorrosion?

I read a article about metallic incorrosion (mild steel) by using new generations of phosphate based on anticorrosion pigments. This article have mentioned the modified pigments appeared to...

06 June 2018 2,616 0 View