ph Ammonia Sodium carbonate NH3 Na2CO3 0.100 M 0.100 M 1.00 g/mL 1.00 g/ml Table
ID: 555919 • Letter: P
Question
ph Ammonia Sodium carbonate NH3 Na2CO3 0.100 M 0.100 M 1.00 g/mL 1.00 g/ml Table 3. Buffer Systems: Weak Acid Weak Base pK Preparation HCOOH HCO0 3.75 to 2 mL HCOOH, add NaOH dropwise 4.74 to 2 mL HC2H302, add NaOH dropwise Ho Cao5.51 to 2 mL KHCot0, add NaOH dropwise HPO HPO NH4 HCOs CO 6.86 to 2 mL K2HPO4, add HCI dropwise 9.26 to 2 mL NHs, add HCI dropwise 10.33 to 2 mL Na2COs, add HCl dropwise NHs 4. You have to make a buffer with a pH of 3.50 and you have the following solutions available: HCOOH, HCHsO2, H&POs;, HCOONa, NaC2Hb02. NaH2PO Which solutions would you use? Use the information in Table 3.Explanation / Answer
4)
The system with the pKa value is near to required pH of buffer is the suitable for buffer preparation.
The required pH of the buffer is 3.50. So, the pKa value near to 3.50 is the suitable for buffer .
Formic acid (HCOOH) and sodium formate (HCOONa) has the pKa value 3.75.
So, the HCOOH and HCOONa solution will be used to prepare the buffer of pH 3.50.
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