Yuav ua li cas sim ntxiv cov tshuaj inorganic i

Yuav ua li cas los ntsuam xyuas qhov ntxiv ntawm cov tshuaj inorganic hauv ACR cov khoom pab ua haujlwm:

Txoj kev nrhiav Ca2+:

Cov cuab yeej sim thiab cov tshuaj reagents: beaker; Lub raj mis zoo li lub khob hliav qab; Lub raj mis funnel; burette; Lub cub hluav taws xob; Anhydrous ethanol; Hydrochloric acid, NH3-NH4Cl buffer solution, calcium indicator, 0.02mol/L EDTA tus qauv kua.

Cov kauj ruam sim:

1. Ntsuas qhov hnyav ntawm cov qauv pab ua ACR kom raug (qhov tseeb txog 0.0001g) thiab muab tso rau hauv lub beaker. Ua kom nws ntub nrog anhydrous ethanol, tom qab ntawd ntxiv cov hydrochloric acid ntau dhau 1: 1 thiab ua kom sov rau ntawm lub cub hluav taws xob kom ua rau cov calcium ions nrog hydrochloric acid sib xyaw ua ke;

2. Ntxuav nrog dej thiab lim los ntawm lub raj mis kom tau cov kua ntshiab;

3. Kho qhov pH kom ntau dua 12 nrog NH3-NH4Cl buffer solution, ntxiv cov calcium indicator kom tsim nyog, thiab titrate nrog 0.02mol/L EDTA tus qauv kua. Qhov kawg yog thaum xim hloov ntawm xim liab mus rau xiav ntshiab;

4. Ua cov kev sim dawb paug tib lub sijhawm;

5. Xam C # a2+=0.02 $(V-V0) $0.04004M $%&&

V - Qhov ntim (mL) ntawm EDTA kua siv thaum kuaj cov qauv pab ua ACR.

V # - Qhov ntim ntawm cov tshuaj siv thaum lub sijhawm sim dawb paug

M - Ntsuas qhov hnyav (g) ntawm cov qauv pab ua ACR.

Txoj kev hlawv rau kev ntsuas cov khoom inorganic:

Cov cuab yeej sim: kev sib npaug analytical, lub cub tawg muffle.

Cov kauj ruam sim: Siv cov qauv pab ua ACR 0.5,1.0g (raug rau 0.001g), muab tso rau hauv lub cub tawg uas kub tas li 950 degrees rau 1 teev, txias, thiab hnyav kom xam cov seem hlawv uas tseem tshuav. Yog tias ntxiv cov tshuaj inorganic rau hauv cov qauv pab ua ACR, yuav muaj ntau cov seem.