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Recent questions tagged #chemistry

Dissolving NaOH(s) in water is exothermic. Two calorimetry experiments are set up. Experiment 1: 2 g of NaOH are dissolved in 100 mL of water Experiment 2: 4 g of NaOH are dissolved in 200 mL of water Which of the following statements is true?

asked Jun 9, 2021 in Chemistry by pehper

Consider the titration of 30.0 mL of 0190 M Aniline ( a weak base) with 0.190 M HCl. Kb for Aniline Kb= 4.3*10^-10

asked Apr 18, 2021 in Chemistry by sora_soren

25.0 ml of 15 M HCl is titrated with 015 M NaOH. Calculate the pH of the solution at each of the following steps in titration.

asked Apr 18, 2021 in Chemistry by sora_soren

A solution contains 0.48 moles of benzoic acid and 0.62 moles of sodium benzoate in 1.0 L of solution. Ka=6.4*10^-5 a) Calculate the pH of this buffer solution b) What will be the pH of the solution after 0.018 mol of NaOH(s) is added to the buffer c) What will be the pH of the solution after 11.0 ml of .800 M HCl is added to the buffer

asked Apr 18, 2021 in Chemistry by sora_soren

rust, aluminium, copper, metal. which is the odd one?

asked Nov 9, 2020 in Chemistry by lolokaydawggy

1. The physician has ordered 1.0 g of tetracycline to be given every six hours to a patient. If your stock on hand is 500-mg tablets, how many will you need for one day’s treatment? Solve & explain the set up & unit conversion

asked Sep 9, 2020 in Chemistry by Kmayes1

If the density of mercury is 13.6 g/mL, what is the volume of 38.9 grams of mercury?

asked Jun 14, 2020 in Chemistry by Serjik

Which of the following does not describe a chelate?

asked Apr 28, 2020 in Chemistry by max2340

What volume of solution contains 10.0 g of solute in 0.408 M Fe(ClO3)3?

asked Apr 27, 2020 in Chemistry by Arianai

What is the minimum volume of 2.02 M H3PO4 necessary to neutralize completely the hydroxide in 183 mL of 0.550 M KOH?

asked Apr 27, 2020 in Chemistry by Arianai

Give the Ka or pKa values that should be entered in the blanks below pka log10 Ka Ka 10pKa

asked Apr 23, 2020 in Chemistry by honeyandtea

A 2L sample of mineral water was titrated with EDTA to determine its hardness in terms of ppm CaCO3(MW=100.087). The EDTA solution was titrated using 247 mg of primary standard CaCO3 requiring 27.8 mL for titration to the Calmagite endpoint. A 50 mL aliquot was titrated with 34.7 mL EDTA. Determine the hardness of the sample. Show solution. Thank you.

asked Apr 22, 2020 in Chemistry by ch3gg444

A 300mg sample containing Na2CO3, NaHCO3, NaOH, and inert material either alone or in some combination was dissolved or titrated with 0.10 M HCl. The titration required 24.41 mL to reach the phenolphthalein endpoint and an additional 8.67 mL to reach the methyl red end point. Na2CO3 (105. 99), NaHCO3 (84.01), NaOH (39.99). Identify the components of the sample. Show solution. Thank you.

asked Apr 22, 2020 in Chemistry by ch3gg444

A graduated cylinder contains 28.0 mL of water. What is the new water level after 35.6 g of silver metal is submerged in the water

asked Feb 6, 2020 in Chemistry by angelvann

What is the frequency of an electromagnetic wave with a wavelength of 0.00315m?

asked Oct 28, 2019 in Chemistry by abmarie2002

Redox reaction between H2C204 and KMnO4 in acidic medium

asked Oct 28, 2019 in Chemistry by Lord_keli

Which molecule is a saturated fatty acid?

asked Apr 29, 2019 in Chemistry by jazzy2134

Which one of the following statements is false?

asked Apr 24, 2019 in Chemistry by kidrhaulxx

After 0.125 mol of HCl is added to a 250. mL NaF solution, the solution pH becomes 3.40. (K_a a of HF is 7.2 × 10^{-4} .) What is the original concentration (in M) of the NaF solution? Assume volume does not change with the addition of HCl.

asked Dec 12, 2018 in Chemistry by neb411

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