Answer Posted / anna

primary standard: is a reagent that is stable, pure, it is not hydrated and is of known concentration. for example, Na2CO3, NaCl etc

secondary standard: is a reagent that is unstabe and very reactive with atmosphere so, have not a conctant concentration. For example, NaOH, H2SO4, etc

Difference between the quantitative analysis and qualitative analysis?

1102

---

how you fix the limits of impurities?

785

---

How to do regeneration of Metacarb Pb plus column?

2510

---

What is the difference between purge septum flow and column flow in gas chromatography?

2474

---

Why only 1.2 million lux hours require in photostability study?

958

---

What is the accrptance criteria in RSD for RS method precision on basis of impurity percentages?

763

---

WHAT IS THE PURPOSE WE USE HCL, CHOPPER, BURNER, MONOCHROMATOR in AAS? PLEASE EXPLAIN BRIEFLY

2562

---

if tech transfer fails whay require to do?

769

---

How to start the dissolution development for unknown tab?

1609

---

What is related substance by HPLC impurity limits as per USP?

1029

---

how you start RS method development when for new product?

657

---

How will u perform degradation study in detectors other thann PDA in HPLC Methodology

2474

---

why we use a particular hplc column for a particular compound give reasons?please

2682

---

What is the diference between residual solvents and organic volatile matter

1955

---

In Dissolution Test why limit is define Q+5% what is the role of +5%.

3041

---