Hydrogen cyanide

Then, on New Year's Day 1845, he arrived at Sarah's house again.

Earlier that day, he stopped at a chemist, and according to testimony later given by a shop assistant named Henry Thomas, John bought two vials of prussic acid.

He said he wanted it as an external treatment for a varicose vein.

Prussic acid was a form of hydrogen cyanide, extremely poisonous, but also used medicinally in the 19th century.

There was evidence that John had previously used it as a treatment for his leg, so the explanation wasn't entirely implausible.

By early evening, John was at Sarah's cottage.

With John in custody, investigators now had to establish what had killed Sarah and whether they could connect her death to him.

Her stomach contents were examined by the chemist, John Thomas Cooper.

This work uses JWST NIRSPEC and MIRI-IFUs to characterize the volatile chemistry and dust mineralogy of the Oort Cloud Comet C2022E3 post-parahelion.

They provide nucleus-centered production rates and maps of column density and rotational temperature for a variety of molecules, including CO, CO2, methane, ethane, methanol, HCN, OCS, and OH.

They also look at water and show that it has a distinct spatial distribution from CO2, CO, methane, and ammonia.

All of those seem to share a dual jet morphology.

Nitrogen appears strongly depleted in comets, and one explanation is that it hides in less volatile ammonium salts, as Rosetta results in 67P and some recent ice detections in disks seem to suggest.

The authors here add acid-based salt formation on grain surfaces to a thermochemical disk model that couples vertical hydrostatic structure, gas heating and cooling, and temperature-dependent gas-grain chemistry.

They see that salts accumulate only in the inner midplane, within roughly 50 AU, where grains are warm enough for acidic partners such as HCN, HNCO, and H2S to diffuse toward relatively immobile ammonia.

Ammonia cyanate dominates as a product, forming from ammonium cyanide, and becomes the main nitrogen carrier after a few million years, while ammonium hydrosulfide is shown to be able to hold nearly all the sulfur.

Ka of CH3COOH is 1.8 times 10 raised to the power negative 5.

And Ka of HCN is 6.2 times 10 raised to the power negative 10.

I know you want me to repeat all this.

All right, so one more time.

KA of HF is 6.8 times 10 raised to the power negative 4.

KA of CH3COOH is 1.8 times 10 raised to the power negative 5.

And KA of HCN is 6.2 times 10 raised to the power negative 10.

Now, Accra Academy.